Hello MS team,
When I used a combobox to show a lookup from Sharepoint, if it had many items selected but there was no way to scroll through or automatically adjust the height so that all the items are able to be seen. In Edit mode, you can select the drop down and view each item selected but do not have that option in View mode.
Combobox View mode could have an option for scrolling, auto-height, swiping, overflow, hidden, or keep it similar to the drop-down style in edit mode.
Thanks for all your hard work!

When a combo-box has multiple items selected it will:
If you are expecting to have multiple selections, it is recommended to increase the height of the combo box in the view form.