New text field won't stay resized

Hi there, quite new to ERPNext and experiencing some small issues. I have read through some of the posts as best I could.

The first is that I added a new “text” field to a form (so it is not “long text”) and it puts a big field on my form. I resized it to be single line height and clicked “update” to leave customize mode.

See attachment if you can.

When I open the form again - bingo - it’s gone back to being a large field.

What is it I could have done wrong here?

Any help or comments or pointers to other resources welcomed.

Kindly
B