If you want to see the policy id in gui you have to click the gear on the left side of the column header in the firewall policy page and select the field policy id there and apply this. Then gui will show you the policy id.
The concept of split tunnelling involves the ability to route specific traffic through the Firewall, which is why you mentioned specifying addresses in the SSLVPN portal. This is the reason you are unable to set "all" addresses in the policy.
To address this issue, you should disable split tunneling from the SSL VPN portal.
Ensure the DNS settings on the device are correct. Sometimes, incorrect DNS settings can prevent internet access. Set DNS to automatic or use a reliable DNS server like Google DNS (18.104.22.168 and 22.214.171.124).
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