In this section I am completely new

I have a question about resolutions I run options 3 TOS404 full, I have a resolution of 640x480x65k colours, in the menu Set Video, I select for example resolution 1280x1024x32 bits, but it does not change,
I can not change the resolution at all
Something's wrong,
I'm using a 22 inch LCD monitor
Under freemint I use Modes application and it is OK