How do I tick intercompany accounts out of the consolidated totals?

Accounts → Settings → GL Exclusions. The list is every GL account (code, name, type, cost head) from the synced charts of every connected organisation — nothing is typed. Search by name or code, filter to one organisation, or show only the excluded ones. The last column is the tick; it saves as you click, and a failed save puts the tick back and says so. Financial Reports, the management pack and Draft Accounts all read this list when they consolidate.