I'm not sure if this is sufficient for your data but you can use a format for the x axis variable to make a log axis "lie to you" and show a 0.
data junk;
do PlotGroup='Group 1','Group 2';
do loop = 1 to 5;
x = rand('uniform') * 10**loop;
output;
end;
end;
run;
proc format library=work;
value logx 1=0
other=[best6.];
run;
proc sgplot data=junk;
hbox x/category= PlotGroup;
xaxis type=log logbase=10 logstyle=linear
;
format x logx.;
run;
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