Please follow my instructions (using the software of Great Wisdom II), and I believe you can see the time-sharing diagram of the past period you want to see soon: open the software-click on the top (view)-click (options)-click (system parameters). On this interface, we can see a lot of system settings, see a column (data saving), and then click a column (minute trading storage day) with the mouse. Tip: Split-pen storage takes up a lot of hard disk space. In general, it is best not to set it for more than 10 days. In addition, you need to ensure that you can close the data after closing every day, otherwise there will be no data to see even if it is set:). After a few days, in the time-sharing interface, just press the down arrow on the keyboard, and the past time-sharing graphics will appear in front of your eyes, wow haha! Do it now ~ ~