Resize the image but no scale

[ovisergiu]

Hi, I have this transparent PNG.
What I need is to make it bigger only on the width (extend the right side so I can add more text layers). 
I tried Image - Scale and increased the width but that's not what I need, since that enlarges the image and it spaces all the layers.

I only need to extend its right side so I can continue adding text layers with symbols (this file contains many symbols added via separate layers side by side so another software will read it.)
How can I make the right side bigger? (extend the right side without disturbind the rest of the image)
Gimp 2.10.30
Windows 10 x64

Thank you!

[programmer_ceds]

"Image/Canvas Size..."
Make sure that the Width and Height fields are not linked (the icon to the right of the fields shows a broken chain)
Set the Width field to the width you want.
If you want the extra width on the right make sure that the X offset is set to 0 and this should give you what you want.