I'm using Sharepoint Online, and there's quite a few WebParts available by default: RSS Reader, document viewer, forum...
I see that editing the source in Sharepoint Designer, I have some more control on how to filter/organize the content displayed by the WebPart, however, I haven't found any way to directly change how it is displayed.
I see that I can also create and upload my own WebParts using Visual Studio. Can I perhaps use Visual Studio to edit some of the existing WebParts that Sharepoint Online provide ?
Thanks for your help !