How can I remove the extra items from an app's toolbar?

Hello all, I have made my first tool bar for an application. I have created 6 buttons for it so far but the tool bar displays elements from my "all apps" Touch Bar (hopefully the image below uploaded, first time so apologies if I've done it wrong).

I have tried checking on/off all of the options for the app's specific settings and I've only managed to make my buttons disappear (not the elements I'd like to remove). Thanks in advance!

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