Golden Ratio
Plugin for the JetBrains Platform, that makes it easier to work while many splits are open by resizing the active editor to be larger. Golden Ratio is inspired by the Emacs and Vim plugins of the same name by Roman Gonzalez.
Best way to install is via the JetBrains Plugin Marketplace.
Usage
Out of the box, GoldenRatio will automatically resize editor panes as the active selection changes. It also provides 2 actions that can be found in Window > Editor Tabs
that are used for manually invoking a resize, or temporally disabling the plugin from resizing on pane selection changes. Both of these can be bound to keys.
Settings are found in Preferences > Editor > GoldenRatio
and let you change what the target ratio is, as well as disabling GoldenRatio from auto invoking when editor pane selection changes.