The Grid Menu (also known as the Hamburger Menu) is now part of Slickgrid-Universal and is enabled by default).
How to use it?
It's Enabled by default
Technically, it's enable by default and so you don't have to do anything to enjoy it. However if you want to customize the content of the Grid Menu, then continue reading.
The Grid Menu comes, by default, with a Column Picker. This brings an easy way to show/hide certain column(s) from the grid. This functionality was copied from the Column Picker Plugin and brought over to the Grid Menu.
Custom Commands
The Grid Menu also comes, by default, with a list of built-in custom commands (all their positionOrder are in the reserved range of 40 to 60)
Clear all Filters (you can hide it with hideClearAllFiltersCommand: true)
Clear all Sorting (you can hide it with hideClearAllSortingCommand: true)
Toggle the Filter Row (you can hide it with hideToggleFilterCommand: true)
Export to CSV (you can hide it with hideExportCsvCommand: true)
_Export to Text Delimited (you can hide it with hideExportTextDelimitedCommand: true)
Refresh Dataset, only shown when using Backend Service API (you can hide it with hideRefreshDatasetCommand: true)
This section is called Custom Commands because you can also customize this section with your own commands. To do that, you need to fill in 2 properties (an array of commandItems and define onGridMenuCommand callback) in your Grid Options. For example, Slickgrid-Universal is configured by default with these settings (you can overwrite any one of them):