How do I choose what activities to create guest labels for?

Update your permitted activities to only show activities you are capturing media of.

To disable a permitted activity:

Go to the Integration Setting
Click the logo of your active integration
Scroll down to the permitted activities
Uncheck the permitted activities you are not taking photos for (e.g. Gift Cards)
Continue scrolling down and click Save

The reason this is important it will reduce the 'noise' of extra labels that you are currently seeing in the mobile app.