Save BG window size & position

[zISKo666]

Requirements

• This issue doesn't already exist
• This is only a single feature request (Otherwise create a separate issue)

Is this proposal related to a problem?

No

Describe the solution you'd like

Window size and position should be saved.
It's a bit annoying to change the size and position of the BG window every time, so it would be a nice addition.

Bye zISKo

Additional context

No response