First, open up the RealSense Viewer’s “Settings” window by left-clicking on the gear-wheel icon in the top corner of the Viewer window and selecting ‘Settings’ from its drop-down menu.
When the Settings window pops up, left-click on the ‘General’ tab at the top of it. Then left-click on the ‘Output librealsense log to file’ box to turn it blue. The current path to the log file will be displayed.
默认存放于此：
打开可看到一堆记录，还有乱码。。。
参考文章：How to get D435 error log file from Intel Realsense Viewer? #5851