So do you then not get landscape mode at all?Solved!
- Open the Settings app.
- Tap Display & Brightness.
- Under Display Zoom, tap View.
- By default, your iPhone is set to standard, which is what allows your iPhone Plus to switch between portrait and Landscape mode.
- To turn off Landscape mode, tap Zoomed. Everything on iPhone will appear larger and this will prevent the Split Screen in Landscape mode from working.