Change Interface Mode

By default after “execute factory reset” FortiGate in Switch mode
In Switch mode, all of the internal interfaces are part of the same subnet and treated as a single interface, which is called either lan or internal by default, depending on the FortiGate model. Switch mode is commonly used in settings where the network layout is fairly basic, with most users being on the same subnet.
In Interface mode, the physical interfaces of the FortiGate unit are configured and handled individually, with each interface having its own IP address. Interfaces can be logically or virtually combined by configuring them as part of either hardware or software switches (for more information, see “Hardware Switches vs Software Switches”), which allow multiple interfaces to be treated as a single interface. FortiGate units that are in Interface mode by default start with a hardware switch called either lan or internal, depending on the FortiGate model. This mode is designed for complex networks where different subnets are used to compartmentalize the network traffic.

-check internal interface switch, whether interface or switch mode

If you only see 1 internal, that mean switch mode. Otherwise interface mode

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-Backup Configuration
go to System/Dashboard/Status/System Configuration
click Backup to Local PC
-change internal to internal1 in backup file
Find internal and Replace with internal1
Save the file
-Restore Configuration
go to System/Dashboard/Status/System Configuration
click Restore from Local PC
it will automatically reboot
-open Console
# config sys global
(global) # set internal-switch-mode interface
(global) # end
Changing switch mode will reboot the system!
Do you want to continue? (y/n) y
After reboot, you will see many internal nic
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