How can I fix bubble under my iPhone screen?

I bought brand New IPhone 14 Pro Max last year. A saler put protective glass after I bought it from the very beginning as I wanted. A month ago I’ve changed it by myself because it was broken a little in the corner and I found like a bubble under the screen in the middle. It looks like technical defect which is visible only when mobile phone is on, and with certain light. Please tell me what is the solution for it

[Re-Titled by Moderator]