Datapages cannot currently be opened directly into Grid Edit mode even if the "Grid Edit" flag is set on the datapage settings. Instead the datapage opens in a list view and items such as checkboxes appear as values yes/no instead of a checkbox.
The datapage is therefore unusable until manually switched to grid edit.

The datapage can be forced to switch to Grid Edit via javascript but the page still loads in list mode and then refreshes when the script is executed which is a terrible user experience and makes the app look very unprofessional.

The "grid edit" (or another setting) should allow for the form to open directly into grid edit mode.

This is basic and standard UI functionality so very surprised that it is missing or that the "grid edit" flag bug has not yet been fixed.