Work Log dialog has a searcher capability on issue field. Search can be done with selecting filter that are ‘All', ’Recent', 'Assigned', 'Reported', 'Watched', 'Internal', 'Filters' on the top and searching text in the issue field as describes in https://denizoguz.atlassian.net/wiki/spaces/WLP/pages/46357205.
After selecting filter and entering text, you will see the issues are divided into two groups ‘History Search' and 'Current Search'. 'History Search' part is the same for the all filters and it shows all past issues you have viewed independent of selected filter. 'Current Search' part shows the issues related to selected filter that matches the text you enter to search area.