@Etonkovidova Thanks for noticing the first issue, that's really a total oversight on my end (and great catch on your end :-)). Split that to T289916: Mentor dashboard M1: Searching and filtering does not work reliably outside of first page, as that's a separate underlying problem, and I think the edge case will need some discussion.

Moving into Needs Discussion per @Urbanecm_WMF 's comment

In T289831#7316350, @Urbanecm_WMF wrote:

@Etonkovidova Thanks for noticing the first issue, that's really a total oversight on my end (and great catch on your end :-)). Split that to T289916: Mentor dashboard M1: Searching and filtering does not work reliably outside of first page, as that's a separate underlying problem, and I think the edge case will need some discussion.

What discussion is needed?

You could maybe use https://doc.wikimedia.org/oojs-ui/master/js/#!/api/OO.ui.TagMultiselectWidget with a limit of 1 item, if you want to make it more clear that the filled in text in the search input corresponds to a username.

Alternatively or in addition, while using prefix search makes sense during the typing input phase (e.g. these queries /w/rest.php/growthexperiments/v0/mentees/prefixsearch/Mente?limit=10) after enter is pressed on a menu item, it should probably not use a prefix search but instead do an exact match.

Hello @kostajh, thanks for asking. This needs decision about how it should work like. My intention was to both allow a prefix search and exact username search, but maybe prefix search is not that useful, considering mentees are unlikely to share a common prefix? If restricting the interface to a single username is decided to be a good option, it can be easily implemented (using what you suggest, or something else). I don't think I should be listed as the decision-maker here, as designing things is out of my expertise.

@OTichonova -- do you have an opinion on whether the prefix search is important?

In T289831#7363261, @MMiller_WMF wrote:

@OTichonova -- do you have an opinion on whether the prefix search is important?

Hey, 
I think prefix search is important, if the mentor doesn’t remember the full username this will allow them to find the right person by seeing the list of people with similar usernames but they might recognise the person they are looking for by their tenure or number of blocks etc. 
Also when there is a list of names in a search recommendation I would expect the user to select the specific name they are interested in. In the case above when the user is looking for ET2, types that, and ET2 & ET24 shows up I would expect them to type ET2 followed by a [space] indicating that they are looking for just that specific username and not ET+anything that follows. But not sure if this is intuitive…