Press H to invoke the LDTK cheat sheet.
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The LDTK Cheat Sheet
LDTK as a piece of software has a lot of functionality and it can take a while to become fluent with it. You will have to use keyboard shortcuts for some of it’s functionality. Luckily, there is a shortcut for opening up a concise help page. Pressing H will toggle the cheat sheet, which contains most if not all of the important shortcuts.
Warning: Some features of LDTK, such as X- and Y-mirroring of tiles, are not supported in Ulix, but are available in LDTK. This is because LDTK is user for other games and projects and is not just for Ulix.