The PicoLog software limits the number of channels that can be displayed at one time. However, the data will still be logged to file.
The workaround for this is to group channels in the Graph and Spreadsheet views and then select which group you wish to view.
Please see the latter part of section 9 of the PicoLog Self-Help Guide (https://www.picotech.com/legacy-document/pdf/picolog-self-help-guide-1.pdf
) for further information.
If you need to view all the traces during capture, you will have to consider running separate instances of the software with no more than two TC-08 devices controlled by each one.