For large lines, you are pretty much stuck in the memory window - the tooltip will eventually be clipped.
Fortunately, data is easy to get in the memory window - I usually show it in 8-byte chunks, so it’s easy to manage, find string data and cut and paste the lot into an empty window, and then use alt + drag to select the columns and remove the hexadecimal values. Then start at the bottom of the line and constantly create / delete (new line) to create your own line (I use a macro for this bit).
I don't think there is a better way when you get long lines.
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