background can probably be changed in the settings file as it's probably a colour
if not then you would have to look in the client object browser for the background
and for the %, look here as the info you need should be here and still works
ahh i didnt even noticed that it was from FM22.
But i do remember ppl talking about Scoreboard selector being wonky, sadly i can't help you as i have no idea about it at all.
I believe that in the "tactics overview side panel.xml"
line 68
<container class="main_contrast_box_no_margin" appearance="boxes/custom/tactic_ssd/paper2" entity_layout_id="it15" id="bakC" wants_mouse_events="true" inset="0" red_replacement="trung2" width="890" name="green background" navigation_container="true">
you need to change it to
<container class="main_contrast_box_no_margin" entity_layout_id="it15" id="bakC" wants_mouse_events="true" inset="0" red_replacement="pitch_box_background" width="840" name="green background" navigation_container="true">