The portal is intended to show records connected to the user's table. But it is possible to show all records from a table, even those that are not linked to the logged-in user. To do this, you need to do the following:
Go to Portal Tables
Click on one of the tables
Custom Views section
Go to one of the Custom Views
Set Choose Records to Display > Show all records.
This will show all records regardless if they are linked to someone else or no one at all.
💡Tip
If you're looking for a way to have an entire COMPANY log into the portal. For example, show the company owner ALL of the orders that are linked to ALL of the salespersons that are linked to that company, check out this article:
Can a portal depend on linked records that are 2 tables away instead of 1 table away?