When APSIS One has been enabled for your APSIS Pro account, you will be redirected to APSIS One after login. APSIS Pro is still available within the APSIS One platform, from the Tools page, see section Tools.

In APSIS Pro, you can go back to APSIS One from the Pro dropdown menu.

To go back to APSIS One from APSIS Pro, select the Pro dropdown menu and select One under MY PRODUCTS.