Comment supprimer les espaces entre deux paragraphes ou un paragraphe et une courbe ?

\documentclass[12pt,space=onehalf]{yathesis}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{kpfonts} 
\usepackage{lipsum}
\usepackage{minitoc}
\usepackage{booktabs}
\usepackage{siunitx}
\usepackage{pgfplots}  
\usepackage{floatrow} 
\usepackage{caption}
\usepackage{microtype}
\usepackage{varioref}
\usepackage[autostyle]{csquotes}
\usepackage[backend=biber,safeinputenc,sorting=none]{biblatex}
\addbibresource{liminaires/bibliographie.bib}
\usepackage{hyperref}
\DeclareSIUnit{\atmosphere}{atm}
\usepackage{pdflscape}
\usepackage{enumitem}
\usepackage{longtable}
\usepackage{multicol}
\usepackage{amssymb} 
\usepackage{amsfonts} 
\usepackage{algorithm,algorithmic}
\usepackage{mathtools,bm} 
\usepackage{chngcntr}
\usepackage{array,multirow,makecell}
\usepackage{footmisc}
\usepackage{tikz}
\makeatletter
\usepackage{graphicx,subcaption}
\usepackage{geometry}
\geometry{top=3cm, bottom=3cm, left=3cm , right=3cm}