Search results are not able to be shown completely in advanced mode when JQL is long.
JQL itself takes most part of whole page space instead of search result, search results are hard to see.
It will be better if the long JQL can be collapsible or scrollable.

Workaround
zoom out via browser

Note
It is similar to a closed ticket of  JRASERVER-71290. However, It does not seem the issue of JRASERVER-71290 is resolved completely. Thus, I raise this JAC ticket for future tracking.