Vega-lite_Remove facet border

amidsi October 28, 2021, 6:40pm 1

What is the way to remove square outline from facets?
My notebook is here

Topic		Replies	Views
Vega_lite_Disable Blank Facet Help	3	846	October 20, 2021
Observable Plot - space size between facets Help	2	735	October 14, 2021
Drop empty facets Help	5	281	April 10, 2024
Vega-lite_Annotation for Facets Help	0	277	October 16, 2021
facets in vegalite Help	0	290	March 30, 2020