A menu with JGRPP is a feature that exists only in JGR's Patch Pack and not in the stable OpenTTD (eg. 1.11.x).
Pause
You can pause the game.
It is unable to build a ride or landscaping, etc.
But, you can build in pause mode if you set Settings → Limitations → When paused allow option.
[Shortcut] F1, Pause Break
Fast forward
You can fast forward the game.
It is unable to fast forward in multiplayer game whether you are server host or client.
You can adjust fast forward limit as set gui.fast_forward_speed_limit (number) in the console command. (0: unlimited, 100 = 1x, 200 = 2x, 50000 max)
[Shortcut] TAB
Fast forward
Game options
You can set like language, autosave, currency, base graphics, sounds, music and so on.
Settings
You can find almost options related to game play at here.
AI/Game script settings
Select an AI that compuer player will use, or select a Game script
NewGRF settings
Open NewGRF settings window.
ZoningJGRPP
Display a tile border in a different box which satisfies some conditions (eg. 3x3 town road grid, etc.)
Trasparency options
Open the Transparency options window. [Shortcut] Ctrl+X
Town names displayed
Display town names
Station names displayed
Display station names
Waypoint names displayed
Display Waypoint names
Signs displayed
Display signs
Competitor signs and names displayed
Display competitor's signs or station names
Full animation
Enable or disable some animated graphics
Full detail
Display all detailed graphics such as fences of rails or street trees.
Transparent buildings
Make buildings in town transparent
Transparent signs
Make background of signs transparent so that just displays names
Income/cost texts displayedJGRPP
Display income/cost texts in the game
[Shortcut] TAB
Disket menu
Save game
Save current game.
Load game
Load saved game.
Abandon game
Stop playing current game and go back to title screen.
Exit
Stop playing current game and quit the game.
Map
Map of world
Show world map window.
Extra viewport
Open an extra viewport window.
Cargo Flow Legend
Show a legend window to display cargo flow.
Sign list
Show the list of all signs on the map.
Extra viewport
A small viewport to see certain place.
Zoom in/out this extra viewport
Change main view: Change main view to the place where this extra viewport is seeing.
Change viewport: Change viewport to the place of current game screen.
Cargo Flow Legend
Legend window to display cargo flows to the map. Middle is company, right is cargo. Click company/cargo what you want to see, or click [All] to show all.
Map
Zoom
Zoom inside screen of map viewport.
Centre to current game screen
Move inside screen of map viewport to the game screen.
Show land contour
Show land contour to display its heights.
Show vehicles on map
Show only vehicles of all companies
Show industries on map
Show industries. You can toggle certain industries by clicking its name at the left bottom side in this window.
Toggle town names on/off on map
You can toggle on/off town names on the map
Show cargo flow on map
Show cargo flow on map.
Show transport routes on map
Show infrastructures such as road or rails.
Show vegetation on map
Show vegetation on map such as trees or deserts.
Show land owners on map
Show land owners on map by their colours.
Towns
Town directory
Show the list of all towns in the world map. You may sort the list by name, population or ratings, and may filter and search the list if you click the black coloured box.
Found town
Found a new town. This menu only appears when Settings → Environment → Towns → Founding towns in game is Allowed or Allowed, custom town layout.
Subsidies
Show the list of subsidies which is currently offered. You can get an additional fee (default: x3) if you transport the cargo between two cities in this list.
Station list
Sorry, it is under construction.
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represents Trains, Road vehicles/Trams, Ships and Aircrafts and shows the only stations they can stop respectively. You may select two or more buttons while pressing CTRL key.
Under construction
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Zoom in/out
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Switch menu
It is only displayed if resolution or window size of the game is too small. You can toggle the half of the menu.