The latest Gutenberg update comes with global reusable blocks and the possibility to lock the editor for block templates, so that the user just can edit the predefined blocks but not remove, add, or move blocks.
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Misc
- »What’s new in Gutenberg? (11th December)«. The 1.9 release introduces reusable global blocks and the ability to »lock down the editor when using templates«, so editing is possible but not removing, moving, or adding blocks ?