Then rightclick and choose
'open-in-piano-roll'
Buuuut im sure thats not the issue at all

See, piano-roll
does open, it is just
not in view!
Im pretty sure your open piano-roll is far out to the right, so just use the scroll-bar in the bottom, and scroll out to the right
When you have located it, maximize it, and it will fit the whole screen.
You may like to watch my rookie-guide-video (link in signature
Besides that since you are new in our forum;
Welcome to the forum Fire&Ashes! Here are all our important links:
http://lmms.io/forum/viewtopic.php?f=1&t=4740
-And a few rules for Avatars, signatures, posting and using the right sub-forum
Let us know if you got it working

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Oh I see.
Yes, I got it to work~ thank you so much for your help

Thank you for the link!