How to disable textarea resizing?

You can use css

disable all

textarea { resize: none; }

only vertical resize

textarea { resize: vertical; }

only horizontal resize

textarea { resize: horizontal; } 

disable vertical and horizontal with limit

textarea { resize: horizontal; max-width: 400px; min-width: 200px; }

disable horizontal and vertical with limit

textarea { resize: vertical; max-height: 300px; min-height: 200px; }

I think min-height should be useful for you

With some css like this

textarea
{
   resize: none;
}

Or if you want only vertical

textarea { resize:vertical; }

Or horizontal

textarea { resize:horizontal; } 

or both ( not your case)

textarea { resize:both; } 

You can put this in the CSS file:

textarea {
  resize: none;
}