I created many sheets with a wrong border, can I reassign another titleblock instead of making all new sheets from scratch?
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Yes. Click on the Titleblock in a Sheet, then in Properties you should be able to select another Titleblock Family--which should be loaded into the Project first.
and if you did many sheets: right click on one and choose Select All Instances, and then choose another loaded titleblock from the Type Selector in Properties. No need to do them one by one.