When a wallet has a large number of transactions in it the drag handle of the scroll bar for the transactions list gets smaller and smaller until it is unable to be seen or grabbed, making it impossible to scroll down the transactions list.

With thousands or tens of thousands of transactions it is literally impossible to look for an old series of transactions in the GUI. (In the Debug Console it is possible to filter the exporttransactions command, with CSV file output.)

Two things can be done in order to fix this:

1. Make sure that the scroll bar can be grabbed and dragged all the way to the bottom, and all the way back up to the top. A minimum size of maybe half a centimetre should be sufficient.
2. The filters at the top include "Filter type" and "Sort by". The wallet also needs a dates filter.