The configuration file allows you to specify the order of the groups in an action bar using the groupPriorities property.

See The action bar configuration options for an overview of all available properties.

When you create a new menu entry, and specify the group, the action bar respects the relative order of the groups configured in the configuration file.

This configuration file snippet shows the initial group priorities of the menu bar:

TLcyMain.menuBar.groupPriorities = FileGroup, \
                                       NewGroup, \
                                         NewLayerGroup,\
                                         NewMapGroup,\
                                         NewOtherGroup,\
                                       OpenSaveGroup, \
                                           RecentFilesGroup,\
                                           ManageFilesGroup,\
                                       WorkspaceGroup,\
                                           RecentWorkspacesGroup,\
                                           ManageGroup,\

The group priorities value is specified in a comma-separated list. It represents the hierarchy of the groups in a flattened list. You can specify the list in a tree layout, to make it easier to read and edit, but this is not mandatory.

This order is respected in the UI, as shown in Menu overview. This figure also shows that a separator is added between two groups to separate them visually.

menu overview
Figure 1. Part of the Lucy File menu with indication of the different groups.

Example: defining the order of the groups

By specifying the groupPriorities setting for an action bar, you can control the relative order of the different groups.

The following snippet and image show the default value of the groupPriorities property for the Lightspeed map tool bar.

Original groupPriorities property for the Lightspeed map tool bar 
TLcyLspMapAddOn.toolBar.groupPriorities=ControlsGroup, ProjectionsGroup, ScaleGroup, ActionsGroup, FogLightGroup, UndoGroup, DefaultGroup
defaulttoolbar
Figure 2. The default Lightspeed map tool bar with indications of the groups.

The ScaleGroup is not visible in the image, because that group currently has no items.

We now adjust the configuration file to place the ControlsGroup at the end of the tool bar.

Moving the ControlsGroup to the end 
TLcyLspMapAddOn.toolBar.groupPriorities=ProjectionsGroup, ScaleGroup, ActionsGroup, FogLightGroup, UndoGroup, DefaultGroup, ControlsGroup

The result of this modification is:

modified lsp map tool bar
Figure 3. Lightspeed map tool bar with modified groupPriorities

Compare this with the original picture and note that the controllers are now located at the end of the tool bar and no longer at the start.