When a form have Glue Points added you can't delete it. No option in the tool bar allows to delete glues.
That's not correct, you CAN remove glue points with context menu or menu 'Edit -> Cut', and also with Del key But more or less reproducible with 3.5.0., it's not intuitive that a 'Delete' item is missing. Nothing new, OOo heritage. And for what a Cut -> Paste function for glue points might be useful - I don't know
Thanks for bugreport In toolbar indeed no such tool. All tools there from category "Drawing". But in this category no tools for deleting glue point. Currently, for deleting glue point we should use "Cut" from context menu Exist also another problem: automatically added 4 glue point, which impossible to delete. And another: glue points not working with grouped objects. No delete glue point in 3.5.3, so not implemented yet, changing status to New
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