You can see in this UI that the UI engine is adding strokes/a border to the side of 3/4 corners here. How do I stop this? The idea of this is that it is a programmable UI corner, for different corners to allow for snapping to other pieces of UI. There is no gap between the 4 image labels and the three frames. In this second image, here is a red border on the frames to show where they are located.
if this in roblox (i can’t tell) then gaps between the UI objects may be because the corner images are being rotated. even if its rotates perfectly 90° and is positioned perfectly, there is still a gap.
this is a roblox bug, and theres no way to fix it. I have dealt with it also.