  Measurements of differential and double-differential cross sections of top
quark pair ($\text{t}\overline{\text{t}}$) production are presented in the
lepton+jets channels with a single electron or muon and jets in the final
state. The analysis combines for the first time signatures of top quarks with
low transverse momentum $p_\text{T}$, where the top quark decay products can be
identified as separated jets and isolated leptons, and with high $p_\text{T}$,
where the decay products are collimated and overlap. The measurements are based
on proton-proton collision data at $\sqrt{s} = $ 13 TeV collected by the CMS
experiment at the LHC, corresponding to an integrated luminosity of 137
fb$^{-1}$. The cross sections are presented at the parton and particle levels,
where the latter minimizes extrapolations based on theoretical assumptions.
Most of the measured differential cross sections are well described by standard
model predictions with the exception of some double-differential distributions.
The inclusive $\text{t}\overline{\text{t}}$ production cross section is
measured to be $\sigma_{\text{t}\overline{\text{t}}} = $ 791 $\pm$ 25 pb, which
constitutes the most precise measurement in the lepton+jets channel to date.
