CrossFlow works from a Premiere Pro project file (.prproj) saved on disk. Click Select Project and pick that file yourself.
If Premiere Pro is installed on this computer, a second button sits next to it: Select Current Premiere Project. It selects whatever project you currently have open in Premiere Pro, so you do not have to go looking for the file. Premiere Pro has to be running, with a project open, and that project has to have been saved to disk at least once. CrossFlow tells you which of those is missing rather than selecting the wrong thing.
You can change project at any time. If you are using Convert Only Selected Sequences, CrossFlow reminds you that your sequence selection does not carry over to the new project, so check which sequences are ticked before converting.
New Project Name is the name the DaVinci Resolve project will be created under. CrossFlow fills it in with your Premiere project's own filename each time you select a project, and you can replace it with anything you like. Your choice is remembered, like every other option. If a Resolve project of that name already exists, CrossFlow asks you before replacing it.
The new project is created in the project library currently open in DaVinci Resolve (Project Manager > Project Libraries), at the top level of its Project Manager. Any local library works, in any folder or on any drive. CrossFlow looks for a project of the same name in all your local libraries before asking, so it may ask even when the existing project is in another library: only the one in the open library is replaced. Network (PostgreSQL) libraries are not supported: CrossFlow stops before changing anything and asks you to open a local library.
CrossFlow reads the project file as it is on disk. So that nothing you changed is left out, when the project is open in Premiere Pro at that moment, CrossFlow first asks Premiere Pro to save it, right before Analyze Project and Convert. If Premiere Pro does not answer within about 20 seconds, for example because a dialog is waiting for you there, CrossFlow goes on with the file as it was last saved.
Every option in the Main tab shows what it does when you hover its name. Your choices are remembered from one project to the next.
By default, CrossFlow converts every sequence of the project. Turn on Convert Only Selected Sequences, in Project Filters, to pick the ones you want from the list of the project's sequences. A search field, Select All / Unselect All and Display In Grid help with long lists.
Nested sequences used inside a selected sequence are always converted with it, even if you did not tick them. If no sequence is ticked while the option is on, Analyze Project and Convert stop straight away and ask you to tick at least one, or to turn the option off to convert every sequence.
The Transfer Options decide what CrossFlow reproduces in DaVinci Resolve. They are all on by default.
The switch next to Transfer Options turns the conversion to DaVinci Resolve off altogether. CrossFlow then only runs Automatic Transcoding: you get the transcoded clips and the "_CrossFlowed" Premiere Pro project, and no Resolve project is created. With both the Transcode and the Transfer switches off, there is nothing to do, and CrossFlow says so. Turning one off is mostly useful to narrow down a problem: if a converted project misbehaves, converting it again with one option off tells you whether that option is the cause.
Two more options, under Media Pool, decide what lands in Resolve's Media Pool rather than how a clip is reproduced:
Before running a real conversion, you can click Analyze Project to get a preview of what CrossFlow would do with your current options, without touching Resolve or Adobe Media Encoder. The result opens in its own window, the same one a past task's Full Details uses, and a Show Analysis Result button stays on the Main tab to bring it back after you close it. It shows:
Every clip list in this window, and in a task's Full Details, shows its first few clips and fades out, with a button underneath to open the whole list. A project with hundreds of transcoded clips therefore stays readable instead of burying the sections below it.
This is an estimate based on your current options. Actual results, and any problem that only DaVinci Resolve can reveal, are only known once you run the real conversion.