The Records Area chart on the page linked (and attached) below will allow you to find where functionalities are in the new MDE. If you use a CTRL + F on the page and search for the function you are trying to do, you will find which menu item to look under. For example, if you are trying to figure out how to view inventory, search for "view inventory" on the page and you will see that this function is under the View Related Data menu option.
NOTE: As of 1/27/21, the new MDE still has glitches. Be patient and document problems you encounter.