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Are you starting your move_base node with a launch file? If so, you would have something like this:

<node pkg="move_base" type="move_base" respawn="false" name="move_base_node" output="screen">
<rosparam file="$(find your_pkg)/common.yaml" command="load" ns="global_costmap"/> <rosparam file="$(find your_pkg)/common.yaml" command="load" ns="local_costmap"/> <rosparam file="$(find your_pkg)/local.yaml" command="load"/> <rosparam file="$(find your_pkg)/global.yaml" command="load"/> <rosparam file="$(find your_pkg)/planner.yaml" command="load"/> </node>

here each yaml file has the configurations for several aspects of move_base. Normally you can use the planner.yaml file to configure the parameter you asked about.

Are you starting your move_base node with a launch file? If so, you would have something like this:

<node pkg="move_base" type="move_base" respawn="false" name="move_base_node" output="screen"> 
<rosparam file="$(find your_pkg)/common.yaml" command="load" ns="global_costmap"/> ns="global_costmap" /> <rosparam file="$(find your_pkg)/common.yaml" command="load" ns="local_costmap"/> ns="local_costmap" /> <rosparam file="$(find your_pkg)/local.yaml" command="load"/> command="load" /> <rosparam file="$(find your_pkg)/global.yaml" command="load"/> command="load" /> <rosparam file="$(find your_pkg)/planner.yaml" command="load"/> </node>

command="load" /> </node>

here each yaml file has the configurations for several aspects of move_base. Normally you can use the planner.yaml file to configure the parameter you asked about.