Hello willya340!
There number of ways to customise pop-up created with FW:
1) rebuild it again in FW;
2) change settings manually on your page (.htm file);
3) change settings manually in .js file (usualy it's fw_menu.js).
I would suggest first way - you may see all changes you do to pop-up view right now. If you prefer to do it manually, here is a tip how to do it (second way):
1) open your page that uses pop-up menu;
2) find function fwLoadMenus() somewhere in the SCRIPT block (usually in HEAD);
3) change parameters of this function to fit your needs. Here is the whole function:
function fwLoadMenus() {
if (window.fw_menu_0) return;
window.fw_menu_0 = new Menu("root",
36,19,"Verdana, Arial, Helvetica, sans-serif",12,"#ffffff","#00538d","#00538d","#8ec6ec");
fw_menu_0.addMenuItem("a","location='a'"

;
fw_menu_0.addMenuItem("b","location='b'"

;
fw_menu_0.addMenuItem("c","location='c'"

;
fw_menu_0.hideOnMouseOut=true;
fw_menu_0.writeMenus();
} // fwLoadMenus()
What you may change is marked
bold.
1) First item -
36 (in my example, you will probably have different settings) - sets the pop-up width, change to your pop-up wider or more narrow;
2) second item -
19 - cell height;
3) third item -
"Verdana, Arial, Helvetica, sans-serif" - sets font family;
4) fourth -
12 - font size;
5)
"#ffffff" - font color;
6) sixth item -
"#00538d" - font hover color;
7) seventh item -
"#00538d" - cell bg color;
8) last item -
"#8ec6ec" - cell hover bg color.
I hope you'll find this helpful, but I would again suggest to rebuild pop-ups using FW!
Good Luck!