To access Bottles preferences, just press the menu button and select Preferences.
Preferences shows four sections:
In the General section you can configure the Bottles appearance and general settings.
Toggle dark mode (turn off the lights)
Show update date (this will toggle the last edit date in the bottles list)
Notifications (choose if Bottles should display notifications in your desktop)
Temp files (toggle to prune the temp directory on Bottles start, this will reduce the disk used by Bottles but also forcing re-download dependencies when installing in new bottles)
Close Bottles after starting a program (this works only when Bottles was started from the file manager or using the CLI)
In the Runners section you can list, browse and install new runners which can be used to create new bottles. Read more.
From the DXVK/VKD3D section you can list, browse and install new versions of DXVK and VKD3D. Read more.