I use TE6.1 (and earlier 5.1). So I'm not sure if this works at TE4.1. So the solution is in the Preferences.upf file.
Report Window ; Specifies the text buffer size (in kilobytes) of the Report Window. Integer ; values between 1 - 1023 are valid; the default is 64. To conserve memory, it ; is recommended that the value be set just slightly higher than the required ; report text size. Text Buffer Size =512