How do I insert new rows and columns in the Table in perspective to draw.io Mockup Text?
Assuming you're referring to the Table object in Mockup Text, when you go into edit mode (double click) select one of the rows. When you do that the table section will appear in the format panel on the right with the usual insert row/colum, before/after.
Table controls appear when a particular cell is selected as shown in the screenshot. Works for all tables, whether from "Misc" or "Mockup" etc.
- Single click selects the table
- Double click selects all the text in the table
- Triple click selects a particular cell contents, and then the table control appears on the panel