Jeremy Hanson will be forced to moderate his confrontational parliamentary style as the new Opposition Leader, Katy Gallagher says.
And the Chief Minister says Mr Hanson's first test in the opposition leadership will come if outgoing leader Zed Seselja wins Liberal preselection to represent the ACT in the Senate.
ACT senator Gary Humphries also welcomed the announcement of Mr Hanson as Mr Seselja's successor.
But Senator Humphries, who is battling to keep his seat, stood by his claims that a plan had been in place for new Deputy Opposition Leader Alistair Coe to take over the leadership in exchange for supporting Mr Seselja's Senate bid.
''I welcome the election of Jeremy Hanson as the new leader of the Liberal Party in the ACT and hope to be able to work with him to advance the Liberal cause in Canberra for some time to come,'' he said. ''I stand by the accuracy of the comments I made to The Canberra Times yesterday but I'm pleased that the plan I disclosed has not been executed.''
Ms Gallagher congratulated Mr Hanson and Mr Coe on their election to the opposition's leadership team in Monday's party room ballot.
''I think the job now for those two is to stop all the fighting that's going on amongst the Liberals and get on with what they've been elected to do, which is represent the people of Canberra,'' she said.
Ms Gallagher said the Brindabella electorate had been let down by Monday's ballot, with neither leader hailing from the southern electorate.
Mr Seselja and outgoing deputy leader Brendan Smyth were both elected by Brindabella voters, who delivered the party its biggest swings in the territory election.
''It's very clear that the commitments to Tuggeranong have been left out in this leadership change,'' Ms Gallagher said. ''Very much, in the campaign, that's where the Liberals' focus was, that's where they got their strongest vote, they had the leader and deputy down there.
''In some ways, Zed's leading the Assembly has on one hand abandoned that commitment but today's decision has meant they have moved both of their leaders out of the electorate that rewarded them with the highest vote that they'd ever got.''
Mr Hanson said on Monday his plan was to keep Mr Seselja on the opposition frontbench, at least in the short term.
But Ms Gallagher said Mr Hanson should not ''be expecting too much'' from the outgoing leader because he had already ''vacated the building'' in spirit. I think he's going to be very busy shoring up the numbers for his Senate preselection,'' she said. ''I don't imagine he's going to be doing much frontbench work.
''I think the real pressure comes and the real first test of Mr Hanson's leadership will be on what terms Mr Seselja departs the Assembly and when he does that.''