When the difficulty of transfer negotiation is set to "strict", clubs are often not interested in accepting competitors' quotations, and players are not interested in going to the lower league or club. Players with club loyalty may not be interested in joining another club. In addition, under the strict difficulty of negotiation, you will not be able to get in touch with the players who have signed the club for less than one year, which means you will not be able to recruit those players who have just transferred immediately.
When the difficulty of transfer negotiation is set to "loose", all the above restrictions will be lifted. This means that under the "relaxed" setting, you can get in touch with all kinds of players more easily, including players who have just moved.
The above information is for reference only. For more detailed and accurate information, please consult the game official.