'Properties' doesn't show 'By layer' for an entity if so assigned but the end result about librecad HOT 6 OPEN

mmm - not sure I understand. In which place so you observe such a behavior? In properties dialog? In active pen buttons?
Please add more details.

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By layer
By block

I do remember there's something logic cleanup needed.

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mmm - I think I finally got it - if properties dialog is invoked for the entity, "By layer/By Block" label is not shown anymore, only actual color name.
Yes, it seems it's my fault related to setup of properties dialogs, I'll fix it. Actually, the intent was to show not a black/white icon for the color in dialogs, but actual color (that same logic as in active pen toolbar).
Anyway, I'll correct this with separate pull request.

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We can keep the color icon and the text "by Layer" for example. Hope it works out for all languages

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yep, that was exactly my original intent - yet there is a bug in implementation I didn't notice.

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I disabled the PenPallet by default.

You can remove the setting, or enable it by:

[CustomToolbars]
UsePenPallet=1

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