Allow UI zoom for desktop application
As a user, I want to be able to zoom into and out of the reading pane, so I can more easily see the text of my emails.
Rationale: Presently, the application seems to default to desktop resolution but the UI and text are very small and I cannot increase them. Being older and having poor eyesight, this makes it very difficult to use the desktop application. In contrast, using the webmail interface, you can easily increase the zoom as needed to make things readable.

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Daygath commented
This is super important. I have the font set to the standard 12 point size and it's almost microscopic. There NEEDS to be a way to view the text at a reasonable size without composing emails in 26 point font which would greatly annoy anyone receiving them.
I'm using the proton mail app on windows.
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Armand commented
So burdensome is the absence of a highly standard and widely used function.
ZOOM IN!!!! ZOOM OUT!!!!
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Michael commented
Yes! I need this! The protonmail APP (desktop on windows) shows emails that are so small. How can I read the text if someone sends me an email with a small fontsize?