LYX - empty space in block

Question

Hey I try to do block in LYX but I get sth like this:

How can I delete this empty space?

My code:

#LyX 2.3 created this file. For more info see http://www.lyx.org/
\lyxformat 544
\begin_document
\begin_header
\save_transient_properties true
\origin unavailable
\textclass beamer
\begin_preamble
\usetheme{Warsaw}
% or ...
\setbeamercovered{transparent}
% or whatever (possibly just delete it)
\end_preamble
\use_default_options false
\maintain_unincluded_children false
\language english
\language_package default
\inputencoding auto
\fontencoding global
\font_roman "lmodern" "default"
\font_sans "lmss" "default"
\font_typewriter "lmtt" "default"
\font_math "auto" "auto"
\font_default_family default
\use_non_tex_fonts false
\font_sc false
\font_osf false
\font_sf_scale 100 100
\font_tt_scale 100 100
\use_microtype false
\use_dash_ligatures false
\graphics default
\default_output_format default
\output_sync 0
\bibtex_command default
\index_command default
\paperfontsize default
\spacing single
\use_hyperref false
\papersize default
\use_geometry true
\use_package amsmath 2
\use_package amssymb 2
\use_package cancel 1
\use_package esint 1
\use_package mathdots 1
\use_package mathtools 1
\use_package mhchem 1
\use_package stackrel 1
\use_package stmaryrd 1
\use_package undertilde 1
\cite_engine basic
\cite_engine_type default
\biblio_style plain
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date false
\justification true
\use_refstyle 0
\use_minted 0
\index Index
\shortcut idx
\color #008000
\end_index
\secnumdepth 2
\tocdepth 2
\paragraph_separation indent
\paragraph_indentation default
\is_math_indent 0
\math_numbering_side default
\quotes_style english
\dynamic_quotes 0
\papercolumns 1
\papersides 1
\paperpagestyle default
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header
\begin_body
\begin_layout Frame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
Brownian Bridge
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Block
\begin_inset Argument 2
status open
\begin_layout Plain Layout
Definicja
\end_layout
\end_inset
\end_layout
\begin_layout Block
\size footnotesize
\begin_inset Formula 
\begin{eqnarray}
p\left(x,y,T,B,\sigma,"\text{DOWN}"\right) & = & \mathbb{P}\left(\exists t\in\left[0,T\right]:S_{t}\le D|S_{0}=x,S_{T}=y\right)\
p\left(x,y,T,B,\sigma,"\text{UP}"\right) & = & \mathbb{P}\left(\exists t\in\left[0,T\right]:S_{t}\ge D|S_{0}=x,S_{T}=y\right)
\end{eqnarray}
\end_inset
\end_layout
\end_deeper
\begin_layout Frame
\end_layout
\end_body
\end_document