So developer said that it's intentional because "dialog doesn't play particularly well when resized".
For those who want to make it re-sizable again:
sudoedit /usr/lib/libreoffice/share/config/soffice.cfg/modules/scalc/ui/standardfilterdialog.ui
<property name="resizable">False</property>
<property name="resizable">True</property>
So developer said that it's intentional because "dialog doesn't play particularly well when resized". libreoffice/ share/config/ soffice. cfg/modules/ scalc/ui/ standardfilterd ialog.ui ">False< /property> ">True< /property>
For those who want to make it re-sizable again:
sudoedit /usr/lib/
<property name="resizable
<property name="resizable