Select Right-to-Left in the Options menu to quickly toggle the active file between left-to-right and right-to-left editing. What this command really does is switch between the “default text layout” and the “layout for opposite text direction” that you selected for the active file’s file type on the Editor page in the file type configuration.
If you have at least one right-to-left keyboard layout installed in Windows, then you can also do this with the Ctrl and Shift keys on the keyboard. To switch to left-to-right, hold down either Ctrl key while pressing and releasing the left-hand Shift key. To switch to right-to-left, hold down either Ctrl key while pressing the right-hand Shift key. These key combinations too switch between the “default text layout” and the “layout for opposite text direction”.
Options menu
Options|Font
Options|Text Layout
File Types|Editor