I get this to work every 3rd try.
Anyway, How To Arch The Text.
It’s called Text On A Path.
HINT: This time it worked when I didn’t stroke the circle. Maybe that’s why it only works every 3rd try, the path can’t be stroked.
To connect 2 layers (like when you look at O in affinity, the middle of the o is transparent and the color is only in the o part – and they are impossible to break apart when converted into curves)
Select both layers and click on subtract at the top (sometimes clicking on add works – no idea why.)