When your client’s computer is powered off, and you need to access it, you can use the Wake on LAN feature. If there’s at least one computer in the target subnet that’s connected to Zoho Assist, or if the router/switch has IP-directed broadcast enabled, WOL will allow you to wake up the system remotely. To implement this feature, navigate to the Settings icon in Assist and select Wake on LAN. Simply enable the Wake on LAN feature.

Prerequisites for Wake on LAN:
Alive Computer on Target Subnet: At least one computer with Zoho Assist should be active in the same subnet as the target machine to perform WOL.
IP Directed Broadcast: This must be enabled on the router or switch to allow WOL signals to reach the remote system.
Here's the detail instructions on Wake on LAN feature.
Here are the detailed instructions on the Wake on LAN feature. With Wake on LAN, you have the power to manage your remote systems efficiently, reducing downtime and ensuring that critical tasks are completed promptly, even after hours.