Sure : File → Export Settings.
2020.01 version
This is now out-of-date. You have to go File –> Manage IDE Settings –> Export settings. You can disable the “Settings repository” under File –> Settings –> Plugins but this doesn’t seem to make a blind bit of difference to your ability to export settings “manually”.
In the later versions it seems like you should go with either configuring a settings repository or using IDE Settings Sync plugin. More information here:
IntelliJ IDEA lets you share your settings between different instances
of your IDE. This helps you recreate a comfy working environment if
you are working from different computers and spare the annoyance of
things looking or behaving differently from what you are used to.You can share your settings in one of the following ways:
By configuring a settings repository. This allows you to sync any
configurable components (except for the list of enabled and disabled
plugins), but requires setting up a Git repository with the settings
you want to share. This option is useful if you want to implement the
same settings among your team-members.By using the IDE Settings Sync plugin. It utilizes the JetBrains
server, so no additional configuration is required. Synced settings
are linked to your JetBrains Account, so they will not be available to
other users. The settings you can sync include: IDE themes, keymaps,
color schemes, system settings, UI settings, menus and toolbars
settings, project view settings, editor settings, code completion
settings, parameter name hints, live templates, code styles, and the
list of enabled and disabled plugins.