If you want Proc Univariate to only display single values try adding the MIDPOINT option to your Histogram statement.
I think from your given picture this might work if your values are only integers 0 to 6.
Histogram /midpoints=0 1 2 3 4 5 6;
If your variables have different ranges of values you would specify a separate histogram statement listing the variables before the / and the specific values for those variables.
Note: if your data is originating from a 0 to 10 scale or similar for ALL the variables and you just don't have some values for some variables you could set the midpoints to use the entire scale and then all the graphs would use the same midpoints.
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