Disclaimer: Boring Video.
To view websites that are usually displayed in ipad ios 12 safari in mobile mode in desktop mode....
Just in the browser's url.. on the right side is the refresh icon. Press and hold the refresh button until a popup appears saying "Request Desktop Site" and click on that.
For ios 13, it's different.
Go into settings , then safari, then "request desktop website" , finally click on the slider until gray (if you want mobile) and click slider until green (if you want desktop site)
Here is my video for setting it up on the newer ios 13:
• Safari now defaulted to Desktop Mode ...