Is there an option to show the formulas in the text editor (not the PDF on the side) so that the text can be edited while the compiled formulas appear. This option exists in emax-auctex. Does it exist in editors like TeXstudio?
Simply right-click the formula and choose "Preview Selection/Parentheses"
Note: for arbitrary environments you need to be at the beginning/end of a parenthesis. But for math formulas, you can click anywhere inside.