Here is the following Steps to edit OOB pages of SharePoint in IE or without SharePoint Designer
E.g. : I want to edit the "Allitems.aspx" OOB page of document library.
- Open the Allitems.aspx page in IE. e.g. "http:/localhost/Documents/Forms/AllItems.aspx"
- Add the following text after the URL "?PageView=Shared&ToolPaneView=2" e.g "http:/localhost/Documents/Forms/AllItems.aspx?PageView=Shared&ToolPaneView=2"
- It will open the OOB page in edit mode.
Thanks
Vikas dhingra