How do I reset this PC from the absolute beginning? I just want to login with a local account.

I have started up a brand-new PC running windows 10 for my work and while in startup it had asked me to sign in, I initially didn't realize the "Domain Join Instead" option at the bottom of the screen, so I signed in with my Microsoft account just to get things started. Shortly after the startup finished, I realized that it is now pulling apps and documents from my OneDrive.

This is a computer that is going to a customer of ours, so I don't want my account to be there permanently, I don't want my account to be there at all. I certainly don't want any of my documents or apps to remain on this PC. I searched through various other threads for help, so I've tried a few things already.

In Start->settings->account->other users I've been able to create local accounts, I've also been able to create local accounts by going to Computer Management (run as administrator)->system tools->local users and groups->users. After creating local accounts however, I am no given the option to switch to them. I do not have "switch to a local account" as an option anywhere under settings->account->your info or other users. Even when I sign out of my account and log back in, it does not list any of the local accounts as other users I can sign in with. Throughout this process, I also do not have the option to delete my Microsoft account from this PC.

I decided to just do a factory reset because this is a brand-new PC and I do not need to save any files on it. To do this, I went to Start->settings->update & security->recovery->reset this PC->get started. From here I selected "just remove my files" and reset the PC. Upon startup, the PC now says, "Welcome to [my] company!" "Enter your [my] Company email." I no longer have the option to do a Domain Join Instead. Clearly this did not reset everything because it still retained my company's info and is forcing me to sign in with a Microsoft email from my company. I just want to reset this PC from the absolute beginning so I can create a local account, but Microsoft is forcing a Microsoft account onto this which we do not want on this PC.