Hello, this is Bandisoft.
When dropping files by Drag and Drop, we intended to display a simplified UI because you have to choose between three functions. (Add File, Open Archive, Create a new archive)
If you want to set the detail options including the compression level when adding files, click the "Add File (添加)" button on the toolbar.
However, as a result of testing, we found a problem where the specified compression level was not applied when adding files.
We will fix it in the next update.
Thank you for your report.
Best regards,