Not sure if it is only me since apparently no one asked before, but I often use my phone or tablet to try something. When I want Z to go negative 300 for example once I tap the Z input, the phone shows me a keypad without the negative sign. My workaround is to open a new tab on the browser, write in the url bar the coordinate -300, copy and paste into Z space. Am I alone in this misery 
In Android using the “Gboard” keyboard there is a - sign.
Are you using iOS? If not maybe install and try the Gboard keyboard.
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Thanks a lot @masze, you saved me from my misery! Gboard has the “-”, samsung keyboard doesn’t
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