hi all,
Longtable in LyX is centered default, and floatrow package also centered table default, but according to https://tex.stackexchange.com/questions/320592/floatrow-package-conflicting-with-centering-longtable , when using floatrow and longtable together, longtable should be declared: \begin{longtable}[c]{ccc} ... Or, longtable will left aligned. The problem is, LyX ommit "[c]" when inserting a longtable, I can not find anyway to add ommited "[c]":-(. So please explicitly add "[c]" to \begin{longtable} declaration from table property dialog window, thanks very much! -- Best regards, Baochen Su