How much did your buying power increase after linking Margin+TFSA?

I was so excited to finally get the option to link them and when I did, my buying power increased by only $6 lol

My TFSA is all stocks, comprised of your typical US companies. Value is approx 150k. $4/5usd cash sitting there which is what I believe is driving my $6 increase….

My understanding was that I could be able to use margin against my assets and not just free cash. Am I mistaken? What increase did you get?