Hello,
You’re welcome!
1-2. Please provide screenshots for better understanding.
3. You may set font settings in Theme Options > Typography > Page.
If you want to change font size only for the element, you may add custom css code, for example, http://prntscr.com/hbl2x5 font-size: 16px;
4. Please try to use this code in Global Custom css:
@media (min-width: 1200px) {
.content-page {
width: 1300px;
}
}
Regards