Grid view is now the default representation for the records in a portal. To show the records in another way, go to:
Portal Tables
Click on the table you want to edit
Go to the Views section
Under Default View Settings, set View Type to either List, Gallery, Kanban, Chart, Calendar, or Map.
At the moment, the Chart view only accepts number and formula field for Y axis.
This view type will be applied to all views of the specific portal table by default. If you want to have a different layout for each view, please refer to this article.
💡Note
By default, the mobile view for the portal displays the List view instead of the Grid, even if you have selected Grid as the preferred layout for a better viewing experience on mobile devices. However, if you still prefer to show the Grid layout, you can change this setting by accessing the portal's settings.