Why are there two UIs?

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## Feature request

**Which Nextcloud Version are you currently using:** Windows 10, Nextcloud Desktop Client 3.15.3

**Is your feature request related to a problem? Please describe.**
Today I struggled to find the option to delete an account to set it up anew: I was in the settings version of the UI. There you can select the account, but you can't remove it. And there is no way to return to the "Main Window". In the Main Window there is a link to settings.

I think the confusion stems from the two different Nextcloud windows and you can't see how they are related. Moreover, because you can start the settings window from the tray icon.

**Describe the solution you'd like**
Settings should be opened inside the "main window" so it doesn't look like a whole different app.

**Describe alternatives you've considered**
Maybe I am too stupid to understand it.

**Additional context**
I **am** too stupid for a lot of things.