Textbox and selecting issue

Hi. THis may just be how access operates but thought i would check. I have a form with textboxes. When i enter a textbox and look to add some words to middle of text box so click in middle of text box it selects all the text to the right of my selection. How do i stop this happening. I want to be able to press the arrow key left and right witin the text box and not have it highlight the text.



Any thoughts appreciated.

Textbox and selecting issue