Hi Dennis,
Under Get Extensions in your Preferences, you can search for cad and there is (among other Addons) the tiny CAD Mesh Tools (haven’t used it myself).
For shortcuts: T toggles the left side Toolbar, N hides the right side N-Panel and CTRL+SPACE toggles the Area where your Mouse is to Maximized and CTRL+ALT+SPACE makes the Area Fullscreen.
Another handy one might be CTRL+ALT+Q over the Viewport to toggle Quad View.
You can hide the Header, by right-clicking the top of the Viewport in the grey area, for instance over the word Object and then un-check Header > Show Header…
You can also make a new Workspace that looks exactly how you want it, for a ‘Master View’, so you can switch to it easily.
