Source: https://divibooster.com/hide-enable-visual-builder-admin-bar-link-on-block-editor-pages/

/* START hide "Enable Visual Builder" from admin bar for Gutenberg
posts --*/
body:not(.et_pb_pagebuilder_layout)
#wp-admin-bar-et-use-visual-builder {
display: none;
}
/* END hide "Enable Visual Builder" from admin bar for Gutenberg
posts --*/
Code language: CSS (css)