Contractor put themself as ownership rites in google console

[GLS3]

Hello,

Bit worried and stressed when I discovered that the contractor i was trying out put themselves on my google console without my knowledge!  I became suspicious when he sent me a screen grab with impressions which could only have come from my google console.  I asked he denied but when I logged on I saw him had permission.  He may have done this within my shopify store in the homepage HTML page! I am not sure.  When I tried to remove him I got this message.

I want to remove him from my homepage an re-instate myself but am unsure how to do this.  Can I have some help from shopify to please help with this. Please help.