On the website they say you can recover it from the Trash can i think.
Looks like it's been added to the FAQ on the page now, Q4: https://ephtracy.github.io/index.html?page=mv_main - "macOS : too slow at retina resolution: disable Brush->Display->HDPI." Hope that helps.
You can press the Tab key in order to switch between model and world editor. I assume that by "positioning mode" you mean the world editor.
Here's the list of keyboard shortcuts on the official documentation: https://ephtracy.github.io/index.html?page=mv_controls
LINK TO SHORTCUTS: https://ephtracy.github.io/index.html?page=mv_controls
Dear G-d! using new to software, for anyone older than 26.5 years, is like entering a secret club where there is a secret codex of communication but they don't tell you it even exists... and then when you finally figure out there is a secret set of rules in order to function... no one will tell you the rules unless you beg and then they speak in another f'ing secret code to tell you about the first secret code.
(link to shortcuts should be easily findable IN THE APP! but noooooooo, that goes against the secret code)
If I’m understanding what you want, sounds like if you type ‘x2’ in the then that console should do the trick!
Some other useful commands here: https://ephtracy.github.io/index.html?page=mv_commands
I’m a big fan of the colour randomising from a provided range.
Point 12 of the FAQ: Program crashed: The model can be recovered from "/cache/backup.vox".
If you go the app's folder, you should find a subfolder named "cache" with the "backup.vox" file. Try opening that file.
The program itself is a freeware so it'll cost you nothing. Check it out here : https://ephtracy.github.io/
I think 4Gb of Ram should be enough to make it work. The video was made by assembling pictures with ffmpeg.
There is no download link other than the most current build on the main site.
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Graphics made with MagicaVoxel, rendered to images and used in libGDX.
Available on Google Play: https://play.google.com/store/apps/details?id=com.aurhe.ap46