How to remove blank option from slicer

JoshuaTo solve this right away - switch to the Hierarchy Slicer

To find out why/when it happens read here - specifically @OwenAuger's post on page 2

http://community.powerbi.com/t5/Desktop/SLICERS-gt-blank-value/td-p/6726/page/2

(For me it happens in a bit different scenario than the example given by Owen - mine involves 4 tables but same principle)

The way I resolved it in my case (Note - I don't know if this would make sense/apply in yours)

I created a new COLUMN in the "many" table - use RELATED ( One SideTable[SlicerColumn] )

to bring to the "many" table only the values you need - and then use this new column instead for your Slicer

Again please note that this works in my case which is slightly different than Owen's example because

selecting Blank in my slicer results in all charts measures visuals showing nothing

unlike in Owen's example which actually if I recall displays a value when blank was selected in the slicer!

(hope this makes sense)

Good Luck!