This may be a long way around, but the below script will output each graph at a 500x500 size, and will stack the separate pages on top of each other, with the different graph builder instances being horizontally arranged. It uses a totally different methodology than using the Page capability in Graph Builder, but it gives the same output but with a standard size graph size per page.
The example uses the Big Class data table, and I only define 2 graphs instead of your example of 3 graphs, but the expansion would be simple.
Names Default To Here( 1 );
dt = Current Data Table();
Summarize( page = by( :sex ) );
New Window( "Resistance - Application", hlb = H List Box() );
bb = Border Box( top( 10 ), bottom( 10 ), Left( 10 ), Right( 10 ), sides( 15 ) ,
vlb = V List Box());
For( i = 1, i <= N Items( page ), i++,
vlb << append(
Eval(
Parse(
"gb = dt << Graph Builder(
Size(500, 500),
Show Control Panel( 0 ),
Show Legend( 0 ),
Automatic Recalc( 0 ),
Variables( X( :age ), Y( :weight ) ),
Elements( Points( X, Y, Legend( 6 ) ) ),where(:sex == \!""
|| page[i] || "\!"));"
)
)
)
);
hlb << append (bb );
bb = Border Box( top( 10 ), bottom( 10 ), Left( 10 ), Right( 10 ), sides( 15 ) ,
vlb = V List Box());
For( i = 1, i <= N Items( page ), i++,
vlb << append(
Eval(
Parse(
"gb = dt << Graph Builder(
Size(500, 500),
Show Control Panel( 0 ),
Show Legend( 0 ),
Automatic Recalc( 0 ),
Variables( X( :age ), Y( :Height ) ),
Elements( Points( X, Y, Legend( 6 ) ) ),where(:sex == \!""
|| page[i] || "\!"));"
)
)
)
);
hlb << append (bb );
Jim