Yes, you can still edit Schedule M, line 1a. If you are in Forms Mode on RI Sch M, and have previously clicked on the box but not entered your details, you may have inadvertently created a supplemental schedule. Click on the + to the left of the box to go to that schedule. At the top of this window, there are commands, such as delete a line, if you do not want to provide a description or do not need more than one line.
Schedule M line 1a, per page 8 of the 2019 Rhode Island Individual Income Tax Instructions
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