I want to set the maximum session count to keep. Add some option in the configuration like "Max sessions to keep" so I can choose it from the menu "Keep sessions". Right now maximum session count I can choose is 10000 but it's too small value for me.
In the black QuickExec box below the Web Sessions list, type:
prefs set fiddler.ui.rules.keeponly 123450
and hit Enter.
As a bug fix, Telerik should consider subscribing to changes in this value so that the toolbar UI updates with the "123450" number without restarting the tool.