While an overall screen size adjustment would be appreciated, you can already move most individual things to adjust for the issue. What text is it that's being cut off? Dialog box? Quest tracker? Item help? ....

Many things can be moved inward a bit using the HUD Layout menu.

Most of the things that don't appear in HUD Layout (dialog box, chat box, and various windows) can be dragged with a mouse or with a controller in mouse mode. (L1+R3 toggles on/off mouse mode (but do it when not on a window that assigns another meaning to L1, like switching between tabs). While in mouse mode, the right analog stick moves a mouse cursor and L2 and R2 act as left and right mouse buttons, so dragging a window would be holding L2 while moving the right analog stick.) In the case of the chat box, to drag it you drag the first "General" tab at the bottom, whereas to resize it you drag the upper right corner.

There are some notifications that cannot be moved by either method, but they tend to be in the center of the screen, so not likely to be what's getting cut off on the right edge.