As stated by dtov on October 19, 2022 4:02 PM below, the feature is here (three dots in the upper right corner).

However, it's still missing a feature to select all messages to be able to label them at oince, for instance:
https://protonmail.uservoice.com/forums/284483-proton-mail/suggestions/7840971-a-select-all-feature

With the magic of java script and FireFox, I was able to delete all messages. Here's the script: https://gist.github.com/rosenpin/a00cf5f2bfac8d589e5790faa896b2ca

Load up Protonmail in your browser. Hit F12. Click 'Console' tab. Copy/paste the script selected from github.

@dtov & Toby

Now show me how to delete 43,000 email in my All Mail folder. No 'three dots' there.

For all the things that ProtonMail does right, there's a very real disconnect of what would seem to be common-sense features, or in this case, consistency of features across the board.

Perhaps, what is most concerning of all, is that this simple issue / request for feature has been made in various places since 2015, and yet it is falling on indifferent ears.

I went from feeling exposed and spied on by Google, to feeling captive and straitjacketed by ProtonMail. At least with Gmail, I had control of my content.

Perhaps a home email server is the way to go.

As dtov notes, this exists if you just want bulk delete.

If you want "select all" and do anything else (archive, move to folder, etc.), please vote on https://protonmail.uservoice.com/forums/284483-protonmail/suggestions/7840971-a-select-all-feature-similar-to-g-mail.

I just deleted 600+ messages from my inbox in seconds.

Just to the left of the page indicator on the right-hand side underneath your username, are three dots( do not have any emails selected because those three dots will disappear ). When you hover your mouse over those three dots, a pop-up bubble will say "more". Give that a click and follow the rest. You're welcome.

I can't believe this feature is not available. It should be really simple to implement an "Empty Folder" feature that works even in the "All mail" tab.

My storage is slowly filling up because, even though I download all mail through Proton Mail Bridge, it does not get removed from Proton's servers. This is also a huge mistake in terms of privacy, as users might think that their communications are no longer available on Proton's servers after downloading them, even though in truth they are. I am already paying for a Plus subscription, I will definitely not pay an additional fee because Proton has chosen not to offer this simple feature, and is asking users to delete emails by hand, 50 at a time...

Adjusting the "default" window size of 50 msgs, to a user option of 50,250,1000, etc., would help here. I too archive my email via my local Thunderbird so moving 50,250,1000 msgs to Trash via the web page helps keep my Proton disk storage available.

Being able to select all emails in a folder and not just 50 at a time would alleviate user issues around storing and manipulating a large amount of emails in a single folder (which can very easily occur through migration from a competing email provider, or just by sheer bulk of incoming emails, potentially both).

Ultimately, large quantity data handling is key to Proton's success against the Big Tech players. Having this feature would be a great step towards enhancing usability.

I just decided to give Proton a try and my Trash filed up in minutes after syncing it with my reg. account. I tried emptying it and it is absolutely not working. How discouraging!

Please add a feature where you can select all emails instead of just 50 at a time. There should be something where you can just delete 50, 100, or all.

GOSTARIA DE UMA OPÇÃO QUE EXCLUISSE TODOS OS EMAILS DE UMA SÓ VEZ DA CAIXA DE ENTRADA SEM TER QUE SELECIONAR DE 50 EM 50

The empty trash button is very well visible in the android app, but in the webmail, it is not called the same, you need to go to the right end of the window inside the trash click on the 3 dots menu et select "delete all". It would make more sense to be consistent with the app and have a single button "empty trash" on the left side of the window in the trash folder, like all other actions.

The reason why this is important is because when you search, all the emails in the TRASH folder show up. Now you might say "just use advance search and select the inbox" The problem is I have many many folders. And you cannot select multiple folders to search in. So if you don't remember where you stored the email, it's frustrating. *IF* there was a "do not search in trash" folder in the search option, than this wouldn't be an issue.

I have 3000 emails in my inbox, I can't keep deleting 50 at a time. I need a way to delete all mail in the inbox. Just give me the option, and give me a pop up box that says "Are you sure?" and let me have my peace. :)

Tutanota has this Feature set up to do it for you about every 30 days.

You can delete an entire mailbox in the new UI by clicking the three dots top right of the window > "delete all".

It's unfortunate that there is still not an easy way to actually "Select ALL" messsages (instead of the 50 that display) at this stage in your product.

This is a show stopper for making the client usable. A critical need is the ability to search for and dispose of useless messages which often number far more than 50.

This is a very critical need for me. Google made it so simple to search your entire email database and do a global delete, move, etc. ProtonMail only gives us 50 search results at a time. Then if you delete the 50 and immediately search again the first results are the ones you just deleted. So the only way then is to dump your trash first then do the search all over again. PLEASE PLEASE help!

Instead of having to delete 50 mails per time, i'd love to have what google mail has, a Delete All button.