We're happy to announce that the fix for this issue is now available in the latest update of InDesign - version 17.2 that is available to download from Creative Cloud Desktop application.
Please update to this latest InDesign version to get the fix.
Adobe InDesign team
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Same issue here! Amazing how much progress Adobe is making their programmes buggier/harder to use/less stable! CS6 on my entry level 2010 MacBook Pro works far, far better than CC 2020 on high spec iMac..