I've reverted to using LTspice XVII ver 17.0.37.0 and abandoned the newer library system in the 17.1 version. The older version works fine i.m.o. and I can get my own created components from my libraries and 3rd party libraries I have inserted into my own user library file and sub-directories by just typing the first couple of letters into the component name search window and it go right into the sub-directories to reveal the options.. In the 17.1 version it will not reveal sub-directories in the menu and one has to explicitly place them in the control panel and when searching for them you have to explicitly open the drop-down list in the library one has added where you added the component.
While I appreciate the free LTSpice from Linear very much, the newer version/s is not nearly as versatile as the older one.
The frequency response analyzer sounds interesting but its native FFT analyser and its trace expression editor is pretty good for me with its two line cursor info that it supplies, by double clicking on the variable name in the plot curves.