How do I set my preferences for Safari?
My websites aren't loading all the way.
iMac 21.5″, macOS 10.13
Safari under macOs High Sierra 10.13 will have some difficulties with some websites. There are nothing you can change in Safari except upgrading macOS, which would upgrade Safari.
If this is not possible, use an alternate browser such as Firefox. Even that version of Firefox is no longer supported and eventually you will encounter the same issues.