  Context: From redshift 6 to redshift $\approx$ 4 galaxies grow rapidly from
low mass galaxies towards the more mature massive galaxies we see at the cosmic
noon. Growth via gas accretion and mergers undoubtedly shape this evolution -
however, there currently exists much uncertainty over the contribution of each
of these processes to the overall evolution of galaxies. Furthermore, previous
characterisations of the morphology of galaxies in the molecular gas phase has
been limited by the coarse resolution of previous observations. Aims: The goal
of this paper is to derive the morpho-kinematic properties of 3 main-sequence
systems at $z\sim4.5$, drawn from the ALPINE survey, using brand new
high-resolution ALMA data in band 7. The objects were previously characterised
as one merger with three components, and and two dispersion-dominated galaxies.
Methods: We use intensity and velocity maps, position-velocity diagrams and
radial profiles of [CII], in combination with dust continuum maps, to analyse
the morphology and kinematics of the 3 systems.} Results: In general, we find
that the high-resolution ALMA data reveal more complex morpho-kinematic
properties. We identify in one galaxy interaction-induced clumps, showing the
profound effect that mergers have on the molecular gas in galaxies, consistent
with what is suggested in recent simulations. A galaxy that was previously
classified as dispersion dominated turned out to show two bright [CII] emission
regions, that could either be merging galaxies or massive star-forming regions
within the galaxy itself. The high resolution data for the other dispersion
dominated object also revealed clumps of [CII] that were not previously
identified. Within the sample, we might also detect star-formation powered
outflows (or outflows from Active Galactic Nuclei) which appear to be fuelling
diffuse gas regions and enriching the circumgalactic medium.
