If you're connected as a leaf, you'll connect to 3 ultrapeers (if you use LW basic) or 5 ultrapeers (if you use LW Pro).

If you connect as an ultrapeer then you'll connect to around 30 peers (other ultrapeers) & around 30 leaves (people with a slower connection & who may be firewalled).

When LW changes your status from leaf to UP, it does that automatically (depending on whether the network needs UPs at the time) so there's no way to control which UPs/peers you're connected to at the time of the changeover.