How to let non-SYSAdmins access Design Mode?
SYSAdmin is the only user who has access right to all data and features in a database. SYSAdmin can create sheets, change sheet design and rearrange the order of tabs and sheets. Sometimes, you might want to let users other than SYSAdmin change the design of certain sheets. For instance, a sales manager might have a better idea on how to tweak the sheet design under "Sales" tab.
SYSAdmin can grant other users right to access Design Mode under certain tabs. First, navigate to Hamburger Menu > User Acesss > Groups, and assign the users as Group Administrator. Next, enter the tab's URL slug in the Group Tabs field (e.g. /forms1, as it appears in the last part of the tab’s URL). Group administrators will be able to add sheets to a Group Tab or make design changes to the sheets under a Group Tab.