Can I edit advanced settings XML with LibreElec? (redefine "<recentlyaddeditems>")

I'd like to increase my recently added items to about 50 instead of 25.

I know there's a lot of stuff we can't mess with on this, my advancedsettings is only this

<?xml version="1.0" encoding="utf-8"?>

<advancedsettings>

<cputempcommand>/usr/bin/cputemp</cputempcommand>

<gputempcommand>/usr/bin/gputemp</gputempcommand>

<showexitbutton>false</showexitbutton>

<remotedelay>1</remotedelay>

<samba>

<clienttimeout>30</clienttimeout>

</samba>

<fanartres>720</fanartres>

<imageres>540</imageres>

</advancedsettings>

and it's located in

/usr/share/kodi/system

What do I add, if I can edit it?

<recentlyaddeditems>35</recentlyaddeditems>

or

<videolibrary>

<recentlyaddeditems>35</recentlyaddeditems>

</videolibrary>

?

videolibrary

<recentlyaddeditems>35</recentlyaddeditems>

What about the existing one, is that being parsed? Should I edit the existing one?

(thanks for reply!)

Also what should it say, if I do a new one?

Exactly this?

<?xml version="1.0" encoding="utf-8"?>
<advancedsettings>
  <videolibrary>
    <recentlyaddeditems>35</recentlyaddeditems>
  </videolibrary>
</advancedsettings>

Very comprehensive response, I'll also confirm and report back - thanks

EDIT:

You're definitely correct.

"[ File 'advancedsettings.xml' is unwritable ]" in the stock folder, so I'll make a new one - thanks

Oh yeah, I assume it doesn't parse them 'together' right? Like it won't combine file 1,2,3 - it'll just read one of the files?

Ok awesome, my recently added is now 45 deep on the front page of Aura, I like it - thank you.