How to permanently stop Low Data mode

Do you have a metered data plan for Wifi or Cellular?

See this, which explains how to turn it on, which will help you turn it off --> Use Low Data Mode on your iPhone and iPad - Apple Support

Then you need to do what MrHoffman suggests and contact your carrier. One sure way to remove this would be to purchase an unlimited data plan, which in today's world aren't all that expensive.

Blbowens wrote:

I keep shutting it off but when I access Apps it comes back on.

Likely because as MrHoffman suggested, it may be required by your carrier. You need to seek help from them. We can't do anything about this for you. Nor can Apple.

Blbowens wrote:

Cellular.

I did check the link you sent but no help to stop Low Data mode.

Check with your carrier. They may well require low data mode.