Text Cursor disappears off right of screen

Hi to TheDoctor259,

welcome to the Apple (user-to-user) Community!

Re: "Text Cursor disappears off right of screen. ... I have to use Accessibility Zoom when typing. The text cursor and recently added text disappear off the right hand side of he screen if I keep typing. How do I keep the cursor and added text. I am running Sequoia 15.3.1"

Am no expert in this area, yet your question deserves some response. Fortunately Apple Support provides articles that can be helpful. There are a few options that you may want to experiment with to find what suits you.

You may want to zoom in and out by tapping on your trackpad (see below)

(The linked article below also explains other options: a keyboard shortcut (or scroll) to Zoom in and out.)

or

You may want to make changes to the size of the zoom area (see further below)

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Apple support's article Zoom in on what’s onscreen on Mac - Apple Support

Eg: says:

Tap to zoom

You can zoom in and out by tapping on your trackpad.

1. On your Mac, choose Apple menu  > System Settings, click Accessibility in the sidebar, then click Zoom. (You may need to scroll down.)
2. Turn on “Use trackpad gesture to zoom”.
3. Do any of the following:

• • Quickly switch between zoomed in and zoomed out: Double-tap the trackpad with three fingers.
  • Zoom in and out gradually: Double-tap the trackpad with three fingers and drag.

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"Change the style, size and location of the zoom area

You can customise how much of the screen you want to zoom and where the zoom area appears.

(1) On your Mac, choose Apple menu  > System Settings, click Accessibility in the sidebar, then click Zoom. (You may need to scroll down.)

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(2) Click the “Zoom style” pop-up menu, then choose how you want zoom to appear on screen:

• Full Screen: Zoom takes up the entire screen.
• If you’re using more than one display, you can zoom each display independently, without affecting the zoom on your other displays. To show a zoomed version of content from one display on a second display, click Choose Display, then choose the second display.
• Split Screen: Zoom is shown on one edge of the screen.
• Picture-in-Picture: Zoom is shown in a box around the location of the pointer.

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(3) If you choose Split Screen or Picture-in-Picture zoom, you can change the size and location of the zoom window. Click Size and Location, then do one of the following:

• For Split Screen: Drag the separator bar to resize the zoom window. To reposition the window, drag it to another edge of the screen. When you’re ready, click OK.
• For Picture-in-Picture:
• Drag an edge or corner of the zoom window to resize it. To reposition the window, drag it to a new location. When you’re ready, click OK.

To set additional options for the zoom style you selected, click Advanced.

See Change Zoom advanced options for accessibility. "

Also: "You can use Accessibility Shortcuts to quickly turn Zoom on or off."

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For more support with an accessibility feature:

If you wish: See: How to contact Apple for accessibility support - Apple Support

All the best :-)

Thank you kindly for taking the time to reply, and to let us know how things worked out for you! Grateful you no longer have that problem ... your post may also encourage others who come looking for answers, to solve their issues too.