Layout Background colour transparency slider

CMS Version

4.0.9, 4.0.11, 4.0.12 - Docker or Debian

Issue

The colour transparency slider (only on the background layout colour) is not present.

image

Only works when typing transparent on input colour.

Unfortunately this is by design because transparent backgrounds are not supported in several of the player platforms.

Oh OK, but this is the only way to create overlapping layout.