Hi, Welcome to the Forum Del-Vez!
Here are all important links:
http://lmms.io/forum/viewtopic.php?f=1&t=4740
-A few rules and useful forum instructions
If you like to introduce yourself, to the community, go here:
http://lmms.io/forum/viewtopic.php?f=4&t=4480
It is because the vst is a little flawed, it ought to re-scale to host, but some fail. To fix that go intoI can't zoom my VSTs in without them cropping, version 1.2.2
Edit| Settings |General,
and where it says PLUGIN EMBEDDING select No-embedding
Should fix it.