Pressing Enter in a code edit region now executes the code. To get a new line in the code edit region press the Shift + Enter keys. In Maple 2020 and earlier, Enter moved you to the next line of the code edit region.

In document mode, if you are in math mode, pressing Enter when your cursor is at the end or middle of the line of math executes and moves the cursor to the next math input (or inserts a new document block if you are at the end of the document).

Note this method of stepping through the document works for math that is evaluated on a new line or evaluated inline. If you have some math that is evaluated inline, and you want to change it to evaluate on a new line, with your cursor on the input, from the Context Panel (or the Evaluate menu) clear the check box for Evaluate and Display Inline. Now the output displays on a new line.

In document mode, pressing Enter when cursor is at the start of the line (the Home position) inserts a new line above. In Maple 2020 and earlier, that was true if you were in a blank line, but otherwise it executed the current document block. This new ability to create white space is indicated visually by the cursor. For more information, see What's New in the User Interface?

Note that the behavior is now different if you are at the start of a nonempty line of math: pressing Enter now creates white space, and does not execute the current line.

The shortcut key F5 now toggles between three states: text, nonexecutable math, and executable math. Previously, it toggled between text and executable math.

When you do not specify a domain for the plot or plot3d commands, Maple 2021 now tries to determine a reasonable domain. In Maple 2020 and earlier, the default domain was either $\mathrm{-10}..10$ or $-2\mathrm{\pi }..2\mathrm{\pi }$. For more information on default plotting domains in Maple 2021, see What's New in Visualization?

Auto Save has changed. Auto Save now saves backup files to the user's home directory. Auto Save also now by default keeps files when Maple is shut down normally. For more information, see What's New in the User Interface?

The queue and stack commands have been deprecated. Use the superseding command, DEQueue instead.