Hello @dglite,
Thank you for letting us know that the My Account page working accurately by following my instructions. I am unable to understand your last-mentioned point. However, I am assuming that you want to create a dashboard page from where vendors will be able to upload their products.
In that case, you need to create a specific page. Then you need to use the shortcode [dokan-dashboard]. Whenever you use this shortcode a dashboard page will generate. However, the appearance will be broken if you missed selecting the newly created dashboard page under the page settings of the Dokan plugin. To select the Dashboard, the admin needs to navigate to WP Dashboard > Dokan > Settings > Page Settings. You will be able to select the Dashboard page there. Please select to get the accurate appearance of the Dashboard.
I am trying to assist you based on my assumption. If the solution is unable to solve any of your confusion then please let us know. I will try my level best to assist you with any of queries.
Thanks!