1. How do I remove or hide or delete workflows and histories other people shared with me ?
History sharing is currently getting another overhaul and will be more consistent with workflow. In both cases there will be a link to "unshare" workflows that have been shared with you. (I thought this link existed for workflow's and was called "Forget", but it doesn't appear to be there).
2. consistency in the workflow management screen "Workflows shared by others" appear as a link (underlined) - clicking on the does the default (and expected) action of "run workflow".
"Your workflows" (mine, that is) - are not links, although they do get a rounded-box-frame when hovered upon - clicking on them does nothing. One has to pin-point the tiny triangle to run/edit/etc on my workflow.
If one clicks on "Workflows"->"All Workflows" from the tools menu, then all workflows appear as clickable-links.
So it's only a tiny matter of consistency.
This is actually all deliberate, though open to debate. We only show the link when there is an obvious primary action. For the "your workflows" list, it wasn't clear to me what that action should be (run vs edit). With shared workflows, there is no edit option. The link from the tool menu is analysis view centric, so we default to run. Regarding tiny arrows... 1) we are going to make it so that clicking anywhere in the button will show the popup menu and 2) the arrows are supposed to be large, and the clickable area even larger than the actual arrow. I wonder if there is a browser issue here, can you send a snapshot of how they appear to you?