Hello,
Take my apologies for the delay in answering. We had some troubles with the topics display.
Yes, we overwrite some Dokan templates but it does not affect the width of the vendor layout because the sidebar appears even with the storefront theme https://gyazo.com/05211ff2e89c5bab9b1c63333010212c and I don’t see the option in Dokan setting to disable the sidebar on the vendor page. I see that you sorted out and hid the sidebar using custom CSS. So, you do still need any help from our side?
Regards