Individual return? Screen 7.1. 2nd item is Estimate Options > State Column > Select one of the options.
In the next section you can input a fixed amount for 2021 estimated tax [O] to make an override.
There are more sections below for Federal and Maryland Adjustment to add or subtract to the 2020 income to do the estimates.
There is a search that might find things for you. Select Lacerte as product first, then use just a few words.
Then click Articles.