From the manual:
openFullscreen(recordId) - opens a record in full-screen mode
openFullscreen(recordId, tabName) - opens a given tab of record in full-screen mode
let i := this;
openFullscreen(openTable("Table Name", "Form Name"))
openTable opens up the target table you want.
Table Name comes first enclosed in double quotes.
View Name comes second, also enclosed in double quotes. Use the view name for your form.
openFullscreen opens in a 'full screen' mode.