In futures software, the red dotted line usually indicates the boundary of the transaction pending order. If you want to remove these red dotted lines, you can follow the following steps:

Open your futures software and enter the chart or K-line chart interface you want to modify.

Find the settings or options menu, usually at the top of the interface or in the menu bar.

In the settings or options menu, find the options related to the pending order boundary. This may be an option called "Transaction Pending List Display", "Pending List Boundary Line" or something similar.

When you find this option, please turn it off or deselect it.

Finally, confirm your changes and close the settings or options menu.

It should be noted that the specific operation of different software may be different. The specific operation method can refer to the help document of the software or online search. If you are not sure how to operate, you can contact the customer service support of the software for help.