You can use a script to copy the info to the clipboard. Size will be zero, if it hasn't been calculated.
// https://resource.dopus.com/t/folder-listing-with-precalculated-sizes-exported-to-txt-files-without-recalculation/42600
// 2022-10-25
function OnClick(clickData) {
var cmd = clickData.func.command;
var tab = clickData.func.sourcetab;
cmd.deselect = false;
if (tab.selected.count == 0) return;
var tmp = '';
for (var e = new Enumerator(tab.selected); !e.atEnd(); e.moveNext()) {
var item = e.item();
tmp += item.name + '\t' + item.size + '\r\n';
}
DOpus.SetClip(tmp);
}
Button as XML
<?xml version="1.0"?>
<button backcol="none" display="both" label_pos="right" textcol="none">
<label>Name+Size</label>
<tip>Copy Filename+Size to Clipboard</tip>
<icon1>#copyfilenames</icon1>
<function type="script">
<instruction>@script JScript</instruction>
<instruction>// https://resource.dopus.com/t/folder-listing-with-precalculated-sizes-exported-to-txt-files-without-recalculation/42600</instruction>
<instruction />
<instruction>// 2022-10-25</instruction>
<instruction />
<instruction>function OnClick(clickData) {</instruction>
<instruction> var cmd = clickData.func.command;</instruction>
<instruction> var tab = clickData.func.sourcetab;</instruction>
<instruction> cmd.deselect = false;</instruction>
<instruction />
<instruction> if (tab.selected.count == 0) return;</instruction>
<instruction />
<instruction> var tmp = '';</instruction>
<instruction> for (var e = new Enumerator(tab.selected); !e.atEnd(); e.moveNext()) {</instruction>
<instruction> var item = e.item();</instruction>
<instruction> tmp += item.name + '\t' + item.size + '\r\n';</instruction>
<instruction> }</instruction>
<instruction> DOpus.SetClip(tmp);</instruction>
<instruction>}</instruction>
</function>
</button>