Squid with multi Gateway Balanced Group

[Netgateuser2019]

Hi, can not find straight answer online about the gateway group and squid.

If I have a "GatewayGroup" with WAN1 - Tier 1 and WAN2 - Tier 1 ( balanced traffic)

And set "GatewayGroup" as default gateway. under System - Gateways drop down.
Will Squid use both links by direct some users thru WAN1 an others to WAN2 or only
to WAN1

thank you in advance