go to the analyze tab. then blank out any entry in the symbol text entry box. this will cause the positions and simulated trades section to show everything. then click on the expand all dropdown panels button which has an icon that looks like multiple overlapping triangles. here's what this should look like:
|analyze tab showing all positions and simulated trades expanded|
when i deleted about a score or so of my old simtrades i got back several hundred megabytes of memory. besides recovering memory, eliminating these forgotten objects speeds up the garbage collector because it then has fewer live objects in its list to evaluate.