Default [Q] How can i remove this and change apptray icon ?

Hi, there !

Can somebody tell me how to remove the one which i marked with red box (i don't know what's it called & i already put the screenshot on attachment) ?

I already decompiled SystemUI.apk using apktools, but i have no idea which one that i have to edit in order to remove the one that i explained above because there are so many folders and files inside SystemUI.apk

Thank you for your kindness & your attention
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