Hi Sebastian,
When we manually change the Recycle Bin size, it only applies to the current account and we could not apply it to other accounts.
What we could do is trying to use group policy or Registry to modify Maximum allowed Recycle Bin size Setting.
https://gpsearch.azurewebsites.net/Default.aspx?PolicyID=2667
Value represents percentage of hard disk that can be used (0 - 100).
Maximum Recycle Bin size:
Registry Hive HKEY_CURRENT_USER
Registry Path Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Value Name RecycleBinSize
Value Type REG_DWORD
Default Value 10
Min Value
Max Value 100
Hope this helps and please help to accept as Answer if the response is useful.
Best Regards,
Carl