Having problems showing your combo box selected items in a label, this tutorial should resolve this issue. You can now create a label inside form part of your combo box to make better visibility to the users. Using COncat we can only show whats selected in combo box without repeating first item (don't use Lookup function)
In my recent tutorials, I'm concentrating heavily on powerapps, model-driven apps, Dataverse, and Power Platform as a whole, When I'm encountering an interesting defect I try to immediately post it on KZfaq to make other people's life easier. Sometimes I'll also touch Power Automate but mostly when it supports Canvas.