UI Mode Tips and Warnings

Tips

Configure one button, then duplicate it. Select it and press Ctrl+D. The copy keeps size, color and actions; drop it in place and Quick Swap the texture. Cloned buttons follow the spacing pattern of the original, with a guide line to keep rows even.
Multi-select to move, clone or delete many buttons at once.
Use color tags as a checklist: yellow for "still needs its texture", green for "tested".
Zoom in for small swatches; at 400% a 20 px button is easy to hit.
Name buttons after what they do (top_red, open_menu). Names do not affect anything, but the layers list becomes searchable by eye.
Press ? on the canvas to see the full shortcut list.

Only 6 faces are supported, numbered like a standard cube. Build the HUD from a cube prim.
Mesh HUDs are not recommended for UI Mode. Their face layout and UV mapping rarely match the cube's, so clicks land in the wrong place.
Both [add-on] - UI Buttons - 1Click and *FUNCTIONS must be inside the HUD.
Hundreds of buttons on one face work, but every click has to be matched against all of them. Very dense faces can feel slightly slower; spread buttons over several faces if you notice it.
Overlapping buttons: the first match wins. Avoid overlaps, or you will get unexpected functions.
FREE accounts can draw and configure, but the buttons do not work in-world until the account is PRO.

If zoom stops responding after an update, clear the browser cache with Ctrl+F5 and reload the panel.