Dear bzzz,
It looks (by reading the code, as I haven’t found it in docs) that there are two parameters controlling this timeout (as in kibana), but in the case of OSD they are:
autocompleteTerminateAfter: duration(100000)
autocompleteTimeout: duration(1000)
So by adding two lines shown below to openseach_dashboard.yml:
opensearchDashboards.autocompleteTimeout: 1000000
opensearchDashboards.autocompleteTerminateAfter: 1000000
I managed to make osd read all menu items.
Hope that helps.