I've found recently that all of the classes available from my custom style sheet aren't available to select from the column dropdown menu. Please see attached screenshots.

Are the classes available in the Styles list? Can you see the effect of the classes on editor content?

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I'm seeing an equal number of classes in the Columns Classes list as in the Styles list in the editor toolbar. In your screenshot above, you appear to have typed something into the Classes list ("box-brackground"), which will trigger the list filter function. If nothing matches the typed in text, then nothing is shown in the list, but the typed in class will still be applied. The reason that some classes are not shown in the Classes or Styles lists is that the selector value is too complex, and only single class selector values are included, eg: "some_class" .some_class is included but not "some_class" .some .some_class The box-background class selector fits this criteria as it is .box-background .wf-column in your stylesheet. If you add an empty value above this in your stylesheet of .box-background {} then it will be included, eg:

.box-background {}

.box-background .wf-column {
  align-items: center;
  background-color: #141747;
  display: flex;
  flex-direction: column;
  justify-content: center;
  margin-bottom: 1rem;
  padding: 2rem;
  text-align: center;
}

Please try JCE Pro 2.9.52 Beta - https://www.joomlacontenteditor.net/downloads/editor/pro/development

This fixes seletion of custom classes in the Classes list, to reset the filter so predefined classes are avilable for selection again.

[quotePost id="115045"]I've just installed the 2.9.52 Beta version, but this still have the same issue. Can you check this is the same for you please?

Your other workaround does work, however if you're working on a new version, we can wait for this...[/quotePost]

Did you add the "box-background" classes to your stylesheet as suggested?

One of the issuses that was fixed was an error when typing in a custom class that was not in the list and pressing Enter, which should create an item in the Classes field (as if you had selected the class from the list). This would also then reset the list filter, allowing the rest of the classes in the list to be seen and selected.

In your case, this would allow you to type in the "box-background" class name and press enter to select it.

JCE Pro 2.9.52 RC is now available - https://www.joomlacontenteditor.net/downloads/editor/pro/development

For example: