I was in the Database area of ReTool, doubled clicked on a jsonb field to edit the content, and this is what I see.
Hi @khill-fbmc, thank you for letting us know! This is a UI bug. Those buttons at the bottom left are to change the editor to different formats, they still work if you click them and won't break anything. Similarly, you should still be able to edit the json object in any of those formats.
We created the bug report. We'll let you know when this issue if fixed. 
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Small UI bug report.
When viewing a JSON value from a DB table (the JSON viewer is a modal), there are no icons on the buttons for format, compact, undo and redo.
@Paulo This seems to have popped up again in the redesigned Retool DB UI:
The buttons and their icons have gone again.
Hi @hansontools,
Thank you for reporting this! I will relay this information to the UI team and add it onto the ticket that Paulo created 