fix: home screen sidebar width is fixed

[vlad-ed-git]

• [x] The width of the side menu bar currently changes with the window size. Native look&feel requires a fixed width side bar.
• [x] The sub-headings for grouping the menu items are not aligned to the left like in a native app.
• [x] There is a lot of space between the two sub-menus. Arrange the menus so that one follows the other immediately.