For connected exchanges, the system will display your entire history of past trades.

In order to ingest the entire history, you need to sync each exchange account: go to Accounts, select an exchange account and press Sync.  The process can take a few minutes.

There are two places you can check your Trasaction history: Portfolio and Trade tab.

The Portfolio tab has a more detailed Transaction history that includes partial order fills, while the Trade tab has data for the entire order (without the partial fills or lots).  A single trade order can be sometimes filled in multiple partial fills.