iMac - desktop screen size problem

[Taya]

Respectable All,
Please assist me with troubleshooting of my iMac screen settings.
I was working with Painter X and enlarged the size of a picture using Wacom Tablet. It appears that after this the desktop screen size has become “larger” than the physical size of the monitor screen . As a result, every time when I move a mouse on a desktop the background screen is moving.
I have tried to change Screen Resolutions, restart the desktop – nothing. Now if I need to use a Menu on a top of the screen for any applications I firstly need to move a mouse such a way that menu is visible.

I am new to Mac. If you could please advise me what I need to change to restore the background screen size to fit the monitor size. Thanks

 

[ergdegdeg]

Hold Control and scroll down

 

[Taya]

Hold Control and scroll down

Many many thanks
If you are in Darwin Australia you'll be my guest!

 

[Redbeastmage]

Hold Control and scroll down

Apple+Option and plus/minus also will zoom in and out on the screen for you. I believe you can disable screen zoom in the universal access options in your system preferences.

 

[dowsy]

iMac - desktop screen size problem

This works, thank you, I had been struggling for ages with this, not aware this was on the system