You should be able to get to the Supporting Details list by putting your cursor in the personal property tax field and clicking Edit > Add Supporting Details at the top of the screen.
Once some Supporting Details have been added, you can double-click on the field for the Supporting Details page to open. Also, if there are Supporting Details entered, you will not be able to edit the personal property tax amount directly.
Going to Forms mode to make changes should not be necessary.
If you can, please confirm whether these steps worked for you. If they did not, then we can take the next step in getting the possible issue reported.
@cwolaw
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