When opening more than 10 Editor Tabs, IntelliJ automatically closes my least used Tab each time I open a new Tab.
How can I increase this limit?
More recent IntelliJ settings are accessed differently than older versions.
Heather92065
Change the Tab Limit under the Tab Closing Policy settings.
Open your IntelliJ settings: Select File -> Settings -> Editor -> General -> Editor Tabs.
Look for Tab Closing Policy -> Tab Limit and change the value to a higher integer.
You can also select to either close non-modified files first or less frequently used files first once your tab limit has been reached.
来源：https://stackoverflow.com/questions/35732379/how-do-i-keep-intellij-from-closing-my-editor-tabs-automatically