Alternate doesn't show in characters map

I have the same issue with you and still font get the solution.

my alternate font appeared in U+F000. Can I change the code into U+E000 so that it can be easier to find in character map?

How I can change the code for PUA?

By default, any unassigned glyph is part of PUAs from U+E900 upwards. To rename an existing glyph to a PUA, you can enter the actual character or rename it like U+905:

image