Yes, you can turn off grammar checking from the QuillBot settings popup. Open the popup by clicking on the QuillBot icon in the browser’s toolbar and flip the switch for “Enable grammar checking for…” from Yes to No. This will disable grammar checking on the website. If you wish to re-enable the Grammar Checker, simply flip the switch back to Yes.
On Google Docs, you can use the sidebar-only mode and filter your suggestions to remove underlines from the page without disabling the grammar checking feature. This allows you to still check grammar when the sidebar is open with no underlines in your document.