The border around active panels is too thick

This will be available in the next version. A new option in Settings > Appearance > Focus borders lets you choose the thickness of the frame around the active pane and of the input fields: Standard (the current 2px), Thin (1px), or No frame (the active pane is then marked only by its highlighted name badge). The choice follows your account on every computer. If it is not what you had in mind, let us know and we will adjust it.

Your request has been resolved and will be available in the next release.