Short Description
Allow users to control how the Proton Mail interface/layout adapts to different screen sizes, offering automatic, preset‑based, fixed, and power‑user‑customizable layout modes.

Proposed Behavior / Modes
1. Automatic
The app detects the current viewport size and selects the most suitable layout on‑the‑fly (compact on narrow windows, spacious on wide ones).
2. Preset‑by‑Screen‑Size
Users create named presets (e.g., Laptop‑Compact, Monitor‑Spacious) that define panel visibility, widths, and other UI choices. The app automatically applies the appropriate preset whenever the detected screen width falls within the preset’s defined range.
3. Fixed (Static) Layout
A single layout is locked and never changes, regardless of window resizing or screen changes. [ we already ahve this ]
4. Power‑User Customizer
Advanced users can freely adjust the size and visibility of any UI section, save the configuration, and optionally bind it to a screen‑size tier or keep it as a permanent static view.

Benefits / Use Cases
1. Predictable cross‑device experience
Users know exactly how Proton Mail will look on a laptop versus an external monitor without manual rearrangement.
2. Reduced friction
No need to repeatedly hide/show panels when docking or undocking; the appropriate preset is applied automatically.
3. Flexibility for all skill levels
Casual users can rely on the Automatic mode, while power users get granular control through the Customizer.
4. Improved productivity
Larger screens can display expanded message lists, preview panes, and additional controls, whereas smaller screens stay uncluttered and focused.

Summary
Introduce pre-selectable layout modes, to give users explicit control over how Proton Mail adapts to varying screen real‑estate, enhancing usability across devices while preserving flexibility for advanced configurations