LYX - empty space in block

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*}
pleft(x,y,T,B,sigma,"text{DOWN}"right) & = & mathbb{P}left(exists tinleft[0,Tright]:S_{t}le D|S_{0}=x,S_{T}=yright)
pleft(x,y,T,B,sigma,"text{UP}"right) & = & mathbb{P}left(exists tinleft[0,Tright]:S_{t}ge D|S_{0}=x,S_{T}=yright)
end{eqnarray*}

end_inset


end_layout

end_deeper
begin_layout Frame

end_layout

end_body
end_document