The moment you sell/buy shares, that number becomes mostly irrelevant. It’s a bit of pain. It won’t take into account overall profits or losses, only what you currently hold…
Where is this “returns”. The chart will show the profit on your current portfolio of open position. Under history, you’ll find the net result of all your closed positions. But yes, the numbers stop adding up after a while. It’s best to simply track your deposits and value yourself, and that will show you your real profit. I’ve made a video about making a spreadsheet before: