Queries used to populate automatically generated pages cannot be found in the Reports tab. They're stored in the tsysDBobjects database table, which you should *not* modify in any way.
Below is web50nolocation's SQL query, pulled directly from tsysDBobjects. You can use it to create a new report under Reports/Create New Report.
SELECT s.AssetName, s.AssetID, tsysAssetTypes.AssetTypeIcon10 AS Icon, s.IPAddress AS [IP Address], tblAssetCustom.Manufacturer, tblAssetCustom.Model,
tblAssetCustom.Location, s.Lastseen
FROM tblAssets AS s INNER JOIN
tblAssetCustom ON tblAssetCustom.AssetID = s.AssetID INNER JOIN
tsysAssetTypes ON s.Assettype = tsysAssetTypes.AssetType INNER JOIN
tblState ON tblAssetCustom.State = tblState.State
WHERE (NOT EXISTS
(SELECT ChildAssetID
FROM tblAssetRelations AS r
WHERE (Type = 14) AND (ChildAssetID = s.AssetID)))
ORDER BY s.AssetName