Undoing "Apply to ...."

Are you trying to say you clicked the 'Apply style to desktop' button in Windowblinds? If so, all you need to do is select a different WB Skin and click the same button again.

Or click the default theme.

It's probably my computer but I find that page very hard to navigate. Nonetheless I found the default theme and applied it.

What do you find hard about it specifically?

I cannot get to the lower part of the page. There are no scrollbars, etc.

Ahh, you can use your mouse wheel to scroll up and down.  There should also be a small blue bar on the right hand side which you can drag.

Maybe you need to increase your resolution.

I'll try increasing the resolution beyond the recommended value but I fear that I will not be able to reead  some text.

Resolution was at max but I changed it anyway. Now I can scroll with the mouse wheel and the scrollbar! Changed it back to max and I can still scroll with mousewheel and scrollbar!

Thanks.

Welcome.