Enlarge the field with a click of the mouse

[TastyToast (Hans Muster)]

Have a look at this post. I think thats what you need. Just with BTN_LEFT for your case.

RIght-click select of screen

I am automating a very GUI-limited application (Meditech 4x workstation). The only way to read the text from the screen is to right-click select the desired area of the screen and copy into the clipboard. How can I simulate a right-click area selection using UiPath?

If your coordinates are not static you need to work with variable type [Rectangle] and [Position]
but there might be an easier approach:

Try:
Get Attribute Activity on the ↔ Element and get the Attribute “position”
Set Attribute Activity on the ↔ Element with CInt(coordinatevariablet.Rectangle.Value.Left.ToString) + amount
amount (Int32) is your shift to the right.

This might work (not sure though)