If you only want the function keys when opening Flame and have the Expanded Control Strip on all the other apps you use try this:
You can set your Touch Bar to show the function keys as its default display on an app by app basis.
To do this:
- Go to Apple > System Preferences
- Select the “Keyboard” preference pane
- Click on the “Shortcuts” tab
- In the left sidebar, select the “Function Keys” option
- On the right-hand side click on the plus button
- Select Flame.
- Add the app
Now, whenever you are using the Flame, the Touch Bar should display all the function keys.