Hi MyraMa,
This is not an issue that can solved by moving the slicer to the top. Screen snapshot shown in original post was taken using September version of Power BI. Here is what happens in the October version. The Filter/ Do Not Filter icons appear to be missing.
Note that this is the exact same .pbix file being viewed in the two Power BI Desktop versions described in original post above.
The good news is that we've inadvertently resolved this issue. Here is a second screen snapshot using October version of Power BI. The difference between this screen snapshot and above is that I now have the cursor hovering over top of one of the other slicers on the screen. The Filter/ Do Not Filter icons display only on the slicer that I'm currently hovering over top of with the cursor. This is different behavior than September release (all icons display independent of where your cursor is on the screen).