CRG Support recomends not to save Mastercontrol password and eSignature in browser 

To turn off "Remember Password" feature and remove saved Mastercontrol passwords in Google Chrome browser you need to go Settings:

Than select Autofill and find mastercontrol.com record in your saved password list as shown on screenshot. Click on triple dots, than Remove

Next when you log on Mastercontrol site, Mastercontrol prompts to save password, you need to click Never.

Your Mastercontrol password and eSignatur won't be saved in browser

To check that your browser doesn't save Mastercontrol password or eSignature, go to Settings->Autofill->Passwords and in section Never Saved check the presence of crgroupe.mastercontrol.com record as shown on screenshot: