QuickLens is a tool-centric app and because of that you will see many of the options on the tool itself. There are a few options that work across many tools and these can be set in Preferences.
New in v1.7 You can now choose to turn off the Dock Icon making your Dock more minimal. When the Dock Icon is hidden, QuickLens goes into the background.
Note The side effect is that QuickLens won’t show up in the Menubar. If you are relying on using any Menu Items, you would have to bring back the Dock. Note that you can get back to Preferences from the Menubar Icon (aka Status Item).
Refer to the section on Global Hotkeys