InDesign has started supporting SEA languages since ID 2020. Adobe WR composer needs to be selected to compose in SEA languages correctly. Since Thai is a SEA language, please use Adobe WR composer for the correct composition of the text.
The fix is now publicly available in the latest InDesign update, 15.1.1
Please update to this latest version to get the fix.
Adobe InDesign team
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Thank you everyone for your continued patience! Apple just released the macOS High Sierra 10.13 Supplemental Update. This will fix the cursor issue with InDesign on macOS High Sierra. Please go to the App Store to update.
An error occurred while saving the commentjo commented
same for me.