This would allow to keep track of character's experience points and levels more easily

Quote from nithyabalan2005 >>

This would allow to keep track of character's experience points and levels more easily

 
We already have this.

Edit Character >> Home tab >> Scroll Down to Advancement Type >> Select XP.

To adjust XP (experience points):

Edit Character >> Class tab >> Click 'Manage XP' below where it says 'Character Level'.

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If in the App replace "Edit Character" with 'Click Gear Icon >> Click Manage Levels'.