Im not sure you can.. imagine if you were like haddad, with 900 games in progress.. things would surely go crazy.
online game page game list

Yeah, when I said default, I meant an option to change my own default setting-- clearly not everyone would want it. For those of us with not a whole lot more than 10 games though, it would be nice. Maybe even an option so the user could specify how many games he wanted shown when he first accessed the page, or a few choices, like choose among show 10, 20, 50, or all games.
There are a lot of times I want to see if a move has been made in a game, but that game would still not be in the top 10 by time priority. Or if I make a move and then want to immediately add a conditional move, the game I just moved in is now not among the 10 listed games. I end up clicking on that "show all" button enough times that I find it irksome, even even if only takes a few seconds each time to click and reload the page.

You could automate clicking on the Show All button using a scripting tool (e.g. AutoIt) that can detect window titles and page content.
I have used it to play a .WAV file (usingSound Recorder) when a browser window (or browser tab) is detected that begins with "MY MOVE!".
When I first display my online game page it shows up to 10 current games, and I can click on the "show all" button at the bottom of the list to add the rest of my current games to the displayed list (usually 12-20 games total for me). Is there a setting I can adjust so the default is that all of my games are always shown when I access the online game page without having to click the "show all" button every single time?