Use the TRANSPARENCY effect to apply the FADE INS.
Later, if you want to remove them, select all overlays by clicking on the first, then hold down <shift> and click the last. Or select individually, using <ctrl>.
Click the FX on one of the selected clips, set opacity to 100%, start to finish, then click the Replace Effect Chain button on the toolbar.

The change will affect all selected clips.
To clear FADE OUTS select the clips, click an
icon and then choose Apply to All Clips. Click the NO TRANSITION item.